______ a good insulator , rubber is often used in cables.A．Having beenB．To beC．

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______ a good insulator , rubber is often used in cables.

A．Having been

B．To be

C．Be

D．Being

答案

解析

现在分词短语表原因。

举一反三

We agree ______ here but so far she hasn’t turned up yet.

A．having met

B．meeting

C．to meet

D．to have met

题型：不详难度：| 查看答案

Every minute is made full use of _______ our lessons.

A．studying

B．to study

C．study

D．being studied

题型：不详难度：| 查看答案

No one noticed him _____ in.

A．to come

B．came

C．come

D．have come

题型：不详难度：| 查看答案

What about the two of us _____ a walk after supper?

A．to take

B．take

C．taking

D．to be taking

题型：不详难度：| 查看答案

They will be very _____ to see you here.

A．pleasing

B．pleasant

C．pleasure

D．pleased

题型：不详难度：| 查看答案