单项选择题

Many people agree that（）knowledge of English is a must in（）international trade today.

A．a; /
B．the; an
C．the; the
D．/; the

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单项选择题

It is not until 1997（）he entered university.

A．which
B．that
C．when
D．since

单项选择题

Smith（）a book about China last year, but I don't know whether he has finished it.

A．has wrote
B．wrote
C．had written
D．was writing

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