单项选择题

It wasgreat shock to the world that two airplanes crashed into World Trade Center in New York on September 11, 2001.

A．a; /
B．the; the
C．a; the
D．/; the

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单项选择题

—Dear me! I've been in America for a month. —______you are settled, why don't you take up some serious study

A．If
B．Now that
C．When
D．Even if

单项选择题

As it turned out to be a problem of no importance, we______so much time look- ing into it.

A．needn't spend
B．didn't have to spend
C．oughtn't to spend
D．needn't have spent

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