单项选择题

______they will send us an invitation is not yet known,______we hope they will.

A．If...but
B．That... so
C．When...yet
D．Whether...but
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单项选择题
Cars moved very slowly in the 1920s, but they______move more quickly than in 1910.
A．were to ,can
B．did
C．will
D．can
单项选择题
I'm afraid it______tomorrow, but who knows
A．may have rained
B．might rain
C．would rain
D．ought to rain
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