If we work hard with a strong will, we overcome any difficulty, however great it is．A．mustB．needC．shouldD．can 题目和参考答案——青夏教育精英家教网—

题目内容

If we work hard with a strong will, we _____ overcome any difficulty, however great it is．

A．must

B．need

C．should

D．can

考查情态动词：A．must必须，B．need需要，C．should需要，D．can表示：有客观可能，句意是：如果有坚强的意志去工作，无论困难有多大，我们都有可能克服它。选D。

练习册系列答案

We the manager , but no one the telephone number .

A．could have called ; knew	B．could have called ; had known
C．could call ; had known	D．could call ; knew

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——It was the drug，not the disease，that killed the boy.
——He would be still alive today if he ________ that drug.

A．not take	B．shouldn’t have taken
C．didn’t take	D．hadn’t taken

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--- It is strange that he ______ come so late.
--- Something unexpected must have happened to him.

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–Where are the students? How could they keep us waiting for so long?
–They started an hour ago and they ____ be here in fifteen minutes, I think.

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