单项选择题

In his culture, ______ it was, this exchange of names on pieces of paper was probably a formal politeness, like saying "thank you."

A．all that
B．whatever
C．whichever
D．what
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单项选择题
Someone who gives an expensive gift often feels that he should receive more praise than if he ______ a less expensive gift.
A．gave
B．gives
C．had given
D．has given
单项选择题
The sun is very large in comparison with its nine ______ planets which, in turn, are circled by a total of thirty-three satellite.
A．surrounding
B．cycling
C．orbiting
D．whirling
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