单项选择题

Was it because it snowed last night ______ he didn't come

A．why
B．that
C．when
D．then
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单项选择题
A．A concert.B．A movie.C．A play.
A．A concert.
B．A movie.
C．A play.
单项选择题
A．have toB．canC．mayD．need
A．have to
B．can
C．may
D．need
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