He made a mistake, but finally he solved the problem __________ it got worse.
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A
until
B
before
C
when
D
as
推荐题目
At that time the blacks reached a stage ________they had almost no rights at all.
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A
when
B
which
C
where
D
what
39.When you read the book, you’d better made a mark ____ you have any questions.
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A
at which
B
at where
C
place
D
where
The old lady had two clever sons, ____ did a good job in the 2010 National College Entrance Exam, though.
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A
none of them
B
both of whom
C
none of whom
D
neither of whom