单项选择题

It was()great 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

He said that books on () popular science are in () short supply.

A.the; a
B./; /
C./; the
D.the; the

单项选择题

--Can I help you --I'd like to buy a present for my father's birthday, () at a proper price, but of great use.

A.that
B.one
C.anyone
D.everything

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