By the time she leaves the stage next month, she __________ for sixty years.

A．will have performed

B．has performed

C．will be performing

D．will perform

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参考答案

【译文】到她下个月离开舞台的时候，她已经表演了60年了。
【解析】本题考查时态的选择。根据将来时间“next month”可知，本句是对将来的一个预测，整句应为将来时态。到一个确切的时间为止，一般选择完成时态。所以应该使用将来完成时态，故选A。

1 I appreciate __________ to your school to give a lecture.

A．to be invited

B．to have invited

C．having invited

D．being invited

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2 __________ , follow the directions on the bottle carefully.

A．When taken drugs

B．When taking drugs

C．When one takes drugs

D．When to take drugs

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3 Mr. Smith __________ be in the bookstore because I saw him in his office a moment ago.

A．must not

B．can't

C．may not

D．needn't

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