— I don’t know ______ Mr. Green will come to see us. — He will help us with our English.
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A
why
B
when
C
how
D
where
推荐题目
David knocked at the door for nearly half an hour______Mary opened it, unwilling.
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A
when
B
while
C
until
D
before
The government has taken some measures to solve the problem of unemployment, but it may be some time ______ the situation becomes better.
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A
before
B
since
C
after
D
unless
He always took a notebook with him _________he could take down something important at all times and all places.
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A
because
B
so that
C
in case
D
if only
All the economists are working on the financial crisis can be prevented, which has caused a huge loss throughout the world.
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A
how
B
when
C
that
D
why
Earth is a rocky planet _______ liquid water, which is necessary for life, can exist.
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A
as
B
which
C
where
D
when