单项选择题

It's half past four in the afternoon. The students are playing ______ basketball now.

A． a
B． an
C． /
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单项选择题
Look ! Some pieces of paper are on the floor. Let's ______.
A． pick it up
B． pick up it
C． pick them up
单项选择题
—Must we do our homework now— No, you ______.
A． may not
B． don't
C． needn't
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