单项选择题

The astronauts and their achievements ______you mentioned stimulate the youth much so that some of them are engaged in astronautics.

[A] which
[B] that
[C] what
[D] whom

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单项选择题

We are going to send advertising material to the ______clients.

[A] irrespective
[B] respective
[C] prospective
[D] perspective

单项选择题

______ being May 1 st, many people go out for a holiday.

[A] That
[B] It
[C] It is
[D] This

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