When he _______ the door, he found his keys were nowhere. A．would op

题型：不详难度：来源：

When he _______ the door, he found his keys were nowhere.

A．would open

B．opened

C．had opened

D．was to open

答案

解析

考查动词时态的用法。句意为：当他要打开门的时候,他发现他的钥匙不见了。动词不定时表示将要发生的动作。

举一反三

If you ________ Beijing Duck，I"d like to treat you to a meal at a famous duck restaurant．

A．didn"t try

B．don"t try

C．haven"t tried

D．hadn"t tried

题型：不详难度：| 查看答案

They said that they ______ a wonderful time in Beijing and they hoped to be there again.

A．had	B．would have
C．would have had	D．could have

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.--- Haven"t I told you that I like the beef well done?
---Yes, but I _____ it longer than I usually do.

A．was cooking

B．will cook

C．cooked

D．had cooked

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Although the causes of cancer_____, we do not yet have any practical way to prevent it.

A．are being uncovered

B．have been uncovering

C．are uncovering

D．have uncovered

题型：不详难度：| 查看答案

—I’ve got to go now.
—Must you ?I ______you could stay for dinner with us.

A．think	B．thought
C．have thought	D．am thinking

题型：不详难度：| 查看答案