题目内容

I forgot ______ something which I have long meant to ask you.

A. to ask
B. having asked
C. to be asking
D. to have asked

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需求大于供给时的价格（）。

A. 在均衡价格之上
B. 在均衡价格之下
C. 将导致需求曲线的移

It is of vital importance that a person ______ at least both physically and mentally strong to be an astronaut(宇航员).

A. shall be
B. be
C. are to be
D. must be

The vitamins necessary for a healthy body are normally supplied by a ______ of fruit and green vegetables.

A. variety
B. fraction
C. section
D. series

The manager ______ all the engagements on the ground that he needed more rest.

A. canceled
B. announced
C. eliminated
D. kept