_____ scores of times , but he still couldn’t understand it ．A．Having explainedB

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_____ scores of times , but he still couldn’t understand it ．

A．Having explained	B．Having been explained
C．Though it was explained	D．It was explained

答案

解析

略

举一反三

With his work ________, he went home happily.

A．finishing

B．to finish

C．finished

D．had finished

题型：不详难度：| 查看答案

They found the remains of buildings _______ under the sand, together with a lot of treasures.

A．being buried

B．buried

C．to be buried

D．burying

题型：不详难度：| 查看答案

I get up early every morning. The fresh air is so good_____________.

A．to be breathed

B．to breath

C．breathing

D．being breathed

题型：不详难度：| 查看答案

It took a long time for the effective use of natural gas_________．

A．to be made

B．to make

C．being made

D．making

题型：不详难度：| 查看答案

Catherine, ____ the alarm clock for 6 o’clock, or you would oversleep and be late for the train.

A．setting

B．sets

C．set

D．to set

题型：不详难度：| 查看答案