单项选择题

In （）century，computers will be used more widely.

A．twenty-one
B．the twenty-one
C．twenty-first
D．the twenty-first

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（）way is more efficient is still a question.

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

单项选择题

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

A.that
B.then
C.when
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