Neversuchadifficultproblem.Itt

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Never______ such a difficult problem. It took me almost half an hour to work it out.

A．had I come across	B．I had come across
C．did I come across	D．I did come across

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If he can his natural ability with hand work, he should be very successful.

A．combine

B．connect

C．link

D．join

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They have the water supplies of the city.

A．cut off

B．cut out

C．cut down

D．cut in

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His sister left home in 2009, and＿＿since.

A．had not been heard of	B．has not been heard of
C．had not heard of	D．has not heard of

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＿＿many times, he still didn’t make sense of it.

A．Having been told	B．Then he was told
C．Being told	D．He was told

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What you said just now me of that American professor.

A．mentioned

B．informed

C．reminded

D．memorized

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