John thinks it would be long ________ he is ready for his new job.
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A
when
B
after
C
before
D
since
推荐题目
The Great Wall is __________ tourist attraction that millions of people pour in every year.
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A
so a well-known
B
a so well-known
C
such well-known a
D
such a well-known
It was not until the teacher had explained it three times _______ how to work out the problem.
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A
did he understand
B
had he understood
C
that he understood
D
that he didn’t understood