3.Professor Black had us ____ compositions every Friday.A.to write B.written C.write D.writing为什么答案是C?我选D4.My watch is broken; I must have it ______.A.repairing B.to be repaired C.to be repairing D.repaired为什么答案是D?不是

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3.Professor Black had us ____ compositions every Friday.A.to write B.written C.write D.writing为什么答案是C?我选D4.My watch is broken; I must have it ______.A.repairing B.to be repaired C.to be repairing D.repaired为什么答案是D?不是
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3.Professor Black had us ____ compositions every Friday.A.to write B.written C.write D.writing为什么答案是C?我选D4.My watch is broken; I must have it ______.A.repairing B.to be repaired C.to be repairing D.repaired为什么答案是D?不是
3.Professor Black had us ____ compositions every Friday.
A.to write B.written C.write D.writing
为什么答案是C?我选D
4.My watch is broken; I must have it ______.
A.repairing B.to be repaired C.to be repairing D.repaired
为什么答案是D?不是有个have sth to do 的句型?
5.He has no alternative but ______ and ask for his brother for assistance.
A.go B.going C.is going D.to go
答案选D我选A 为什么?

3.Professor Black had us ____ compositions every Friday.A.to write B.written C.write D.writing为什么答案是C?我选D4.My watch is broken; I must have it ______.A.repairing B.to be repaired C.to be repairing D.repaired为什么答案是D?不是
have sb.do sth.强迫某人做某事
have sth.done 找别人对某物做什么什么,example:have my hair cut 找别人来理我的发.发是被理的,表是被修的,OK?
A是谓语形式,而此处需要的是介词宾语,必须用非谓语形式.动名词和不定式都可以作宾语,因and后的ask用的是原形,所以选择不定式而不选动名词.

3.前面已经有had了，write就不能写成writing
4.表只能被修，所以排除A,C；如果是B，后半句应改成“It must to be repaired
5.but后面如果跟的是动作，就要加介词，跟名词可以不加
还有疑问再问我

全是固定搭配，OK

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