When about one of the biggest problems today, many experts say that an ene

题型：不详难度：来源：

When about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind"s survival．

A．asked

B．being asked

C．having asked

D．asking

答案

解析

略

举一反三

Five books on the shelf are found ______.

A．tear

B．tearing

C．tore

D．torn

题型：不详难度：| 查看答案

At the age of 29, Dave was a worker, in a small apartment near Boston and ______ what to do about his future.

A．living; wondering

B．lived; wondering

C．lived; wondered

D．living; wondered

题型：不详难度：| 查看答案

As is known to all, to smoking will do harm to your health.

A．addicted

B．having addicted

C．being addicted

D．after being addicted

题型：不详难度：| 查看答案

His mother always keeps telling him to ______ his table manners.

A．care

B．observe

C．mind

D．notice

题型：不详难度：| 查看答案

Some medicine, when wrongly____,can kill a person.

A．take

B．taking

C．Taken

D．to take

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