单项选择题

A bottle weighs more after air is put in. proves that air has weight.

A) We
B) Which
C) It
D) What
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that you've got something to do in the evening, I won' t keep you.
A) Since
B) Now
C) When
D) For
单项选择题
Vince is Learning Chinese in my class. Andy.
A) So is
B) So does
C) Nor does
D) Neither is
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