单项选择题

If it had not been for the snow, we () the mountain yesterday.

A.can have climbed
B.could climb
C.can climb
D.could have climbed

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单项选择题
Something was wrong with the engine of the plane. The pilot had to make().

A.a forced land
B.a forced landing
C.forced land
D.forced landing
单项选择题
He () the bike to be cheap but found it expensive.

A.think
B.have thought
C.had thought
D.thought
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