单项选择题

I don"t doubt ______ the plan will be well-conceived.

A．that
B．whether
C．why
D．when
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单项选择题
Never before ______ such a smoke in the room.
A．have I read
B．did I read
C．do I read.
D．am I reading
单项选择题
Cars moved very slowly in the 1930s, but they ______ move more quickly than in the 1920s.
A．were to
B．did
C．will
D．can
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