单项选择题

The atmosphere is consisted of certain gases mixed together in definite proportions.().

A. The atmosphere
B. is consisted
C. mixed together
D. in

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The only thing what really matters to the children is how soon they can return to their uncle's farm.().

A. what
B. to
C. is
D. how soon
单项选择题
I'd have come with you () I am so busy.

A. except for
B. provided that
C. but that
D. so long as
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