Scientific experiments __________ by students without the teachers’ instructions

题型：不详难度：来源：

Scientific experiments __________ by students without the teachers’ instructions can be dangerous.

A．carry out

B．carrying out

C．carried out

D．carrying

答案

解析

考查非谓语动词experiments与carry out为动宾关系要用过去分词作定语。句意：学生没有老师指导做科学实验有可能有危险。

举一反三

It ______ be better if I could earn enough money to buy a private car.

A．will

B．must

C．shall

D．would

题型：不详难度：| 查看答案

In many factories computers have ___________ the work of thousands of workers.

A．taken place

B．taking place

C．taken place of

D．taken the place of

题型：不详难度：| 查看答案

You’d better not call me up between 7 and 8 this evening, for I ____ an important meeting then.

A．will have

B．am having

C．will be having

D．will have had

题型：不详难度：| 查看答案

—Alice, you look puzzled．Haven’t you understood it?
—Yes．I _of another problem just now．

A．had thought

B．have thought

C．thought

D．was thinking

题型：不详难度：| 查看答案

Please be sure to telephone me next time you to our city .

A．will come

B．come

C．came

D．are coming

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