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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单项选择题
in ancient times, the book still appears to readers today.
A) Though written
B) It was written
C) Though it written
D) Written it was
单项选择题
that you've got something to do in the evening, I won' t keep you.
A) Since
B) Now
C) When
D) For
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