单项选择题

（）way is more efficient is still a question.

A.What
B.Which
C.That
D.Whether

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单项选择题
It was in the winter of 1951（）a heavy fog moved into London.

A.that
B.then
C.when
D./
单项选择题
Just （）to him，and you will see how clever he is!

A．to listen
B．listen
C．listened
D．listening
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