单项选择题

If the whole framework of the thesis ______ beforehand, a great deal of time and energy would have been saved.

A．was designed
B．had been designed
C．were designed
D．has been designed

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单项选择题

We looked for a table to sit down, but they were all ______.

A．reserved for
B．engaged in
C．used up
D．taken up

单项选择题

Bit by bit, a child makes the necessary changes to make his language ______.

A．as other people
B．as other people's
C．like other people
D．like other people's

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