题目内容

Without the dreams of the youth, this invention might_____ for a century.

A. postpone
B. be postponed
C. have been postponed
D. has been postponed

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For a child to give up his less mature idea for a more mature one, it requires that the child _______ psychologically ready for the new idea.

A. is
B. were
C. be
D. would be

Your advice that______ till next week is reasonable.

A. she waits
B. wait she
C. she wait
D. she waited

It was essential that we _____ lease before the end of the month.

A. sign
B. signed
C. had signed
D. were signing

It is appropriate that some time ______thorough study of the results of the Apollo mission.

A. is devoted to
B. devotes to
C. devoted to
D. be devoted to

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