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问题 选择题

---Where is my reference book? It was here a moment ago.---Someone ___ it by mistake.

A．could have taken

B．must take

C．might take

D．must have taken

答案

答案：D

在肯定句中对过去发生的事情的推测要用must have done。这里表示肯定有人错拿了。

填空题

当企业同时具备所有权优势，（）和区位优势时，企业才能开展对外直接投资。
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单项选择题

Sometimes we have specific problems with our mother; sometimes, life with her can just be hard work. If there are difficulties in your (1) , it’s best to deal with them, (2) remember that any (3) should be done (4) person or by letter. The telephone is not a good (5) because it is too easy (6) either side to (7) the conversation.

Explain to her (8) you find difficult in your relationship and then (9) some new arrangements that you think would establish a (10) balance between you. Sometimes we hold (11) from establishing such boundaries because we are afraid that doing (12) implies we are (13) her. We need to remember that being (14) from our mother does not (15) mean that we no longer love her. If the conflict is (16) and you cannot find a way to (17) it, you might decide to give up your relationship with your mother for a while. Some of my patients had (18) "trial separations". The (19) allowed things to simmer down, enabling (20) .

12（）

A.it

B.which

C.what

D.so
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