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This problem is said _______ three times, but he still can’t understand it.

A．to have been explaining	B．to have explained
C．having been explained	D．to have been explained

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相关试题

This machine is very easy______. Anybody can learn to use it in a few minutes.

A．operating

B．to be operating

C．operated

D．to operate

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Don’t blame the worker. He just carried out the order______.

A．as told

B．as are told

C．as telling

D．as they told

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I can’t remember when ______ turning point occurred exactly, but it might be ______ summer morning when I was in New York.

A．不填；a

B．a; a

C．the; a

D．a; the

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—Nancy, can you help me type this report, please?
—_______I have a lot of work to do.

A．What for?

B．Why me?

C．That’s easy.

D．Don’t bother me.

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Is this the recorder you want________?

A．to have repaired	B．to repair it
C．to have it repaired	D．it repaired

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