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【单选题】

I am quite busy. I don't know _______ I will have time or not tonight.

[ ]

A.
if
B.
weather
C.
whether
D.
when
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参考答案:
参考解析:
.
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举一反三

【单选题】His parents __________ ping-pong.[ ]

A.
don't play
B.
doesn't play
C.
aren't play
D.
plays