13.- How long have you worked here?-_____C___A.Since about two years.B.I do not know.C.For about two years.D.Who knows.14.- Sorry to have kept you waiting.- _____A ___A.That's OK.B.What are you doing?C.What's wrong with you?D.Where have you been?

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13.- How long have you worked here?-_____C___A.Since about two years.B.I do not know.C.For about two years.D.Who knows.14.- Sorry to have kept you waiting.- _____A ___A.That's OK.B.What are you doing?C.What's wrong with you?D.Where have you been?
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13.- How long have you worked here?-_____C___A.Since about two years.B.I do not know.C.For about two years.D.Who knows.14.- Sorry to have kept you waiting.- _____A ___A.That's OK.B.What are you doing?C.What's wrong with you?D.Where have you been?
13.- How long have you worked here?
-_____C___
A.Since about two years.B.I do not know.
C.For about two years.D.Who knows.
14.- Sorry to have kept you waiting.
- _____A ___
A.That's OK.B.What are you doing?
C.What's wrong with you?D.Where have you been?

13.- How long have you worked here?-_____C___A.Since about two years.B.I do not know.C.For about two years.D.Who knows.14.- Sorry to have kept you waiting.- _____A ___A.That's OK.B.What are you doing?C.What's wrong with you?D.Where have you been?
completely right.You're intelligent.

对的

对的（A可以改成since two years ago）
第14题该选C，问句的意思是我很抱歉让你等了我这么久，回答应是C，你怎么了，表示关切；A的意思是那很好，应该是 it doesn't matter没关系

13题：现在完成时问时间回答方式只有since+时间点或者for+时间段，明显C是对的。
14题：很抱歉让你一直等，回答肯定是：没关系 A对

ok

How long have you been hehe ,what have been doing for all day long Y how are u how long have you been learning english? How long have you been studying? How long will I have to How long ____you___(have)your car? How long have you been in China? known,how long,have they,each other How long have ;Tom and Mary -------[结婚] How long I have to wait how long have you been dancing today? how long have you studied in this How long have you been there? How long have you live in China How long have you ----(live)here? how long have they 还是用them how long have they 还是用them “How long have you been watching