The climbers succeeded in climbing to the top of the mountains, and they owed their success to the preparations they ______.
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A
make
B
had made
C
made
D
have made
推荐题目
——Ann is in hospital.——Oh, really? I_______ know.  I_______ go and visit her.
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A
didn’t; am going to
B
didn’t; will
C
don’t;would
D
don’t; will
Hurry up, kids! The school bus _______ for us!
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A
waits
B
was waiting
C
waited
D
is waiting