单项选择题

It was essential that he（）the contract before the end of the week.

A．sign
B．would sign
C．signed
D．could sign

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单项选择题
Tom failed the exam but his sister（）

A．got in
B．got over
C．got out
D．got through
单项选择题
Training astronauts（）not an easy thing.

A．are
B．is
C．were
D．be
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