can you tell me if he _finish the work on time?A,is able to B,was able to C,could为什么?

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can you tell me if he _finish the work on time?A,is able to B,was able to C,could为什么?
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can you tell me if he _finish the work on time?A,is able to B,was able to C,could为什么?
can you tell me if he _finish the work on time?A,is able to B,was able to C,could
为什么?

can you tell me if he _finish the work on time?A,is able to B,was able to C,could为什么?
A
主情从现,条件句的从句要用现在时
B是过去式,C这个情态动词表能力要用be able to 替代

A 一般现在时，选A

答案是A be able to和can的区别在于，can是能不能，而be able to是表示有没有这个能力去做某事。 题可翻译成：你告诉莪他是否能按时完成这项工作？很显然，是问他是否有这个能力来完成，所以choose A。

A ，因为 if he _finish the work on time是一个宾语从句，宾语从句受主句时态上的影响，因为主句是现在时，所以不用考虑时态。再看can 和be able to的区别，7140314这位用户说的不完全对，他们的区别在于，can只有原形和过去式，而be able to的形式则更为全面，有过去式，现在式，完成时，将来时等等，所以这里因为can用了过去式could 所以C不对。...

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A ，因为 if he _finish the work on time是一个宾语从句，宾语从句受主句时态上的影响，因为主句是现在时，所以不用考虑时态。再看can 和be able to的区别，7140314这位用户说的不完全对，他们的区别在于，can只有原形和过去式，而be able to的形式则更为全面，有过去式，现在式，完成时，将来时等等，所以这里因为can用了过去式could 所以C不对。再看句意，这句话的意思是说，“你能告诉我他是否会及时完成他的工作吗？”由on time可知他还没有完成他的工作，所以一定不是B选项的过去式，那就只能用一般现在时is able to来代替一般将来时了。
话可能有点多，但是是很好理解的，希望能帮到你。欢迎采纳！谢谢！

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