Mark needs to learn Chinese _______ his company is opening a branch in Beijing. 
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A
unless
B
until
C
although
D
since
推荐题目
Put the books back ________ they belong after you have finished them.
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A
where
B
to where
C
to which
D
to the place
If he ___________ on time, we will go without him.
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A
doesn’t come
B
don’t come
C
didn’t come
D
comes
 I met several people there, two of _____were foreigners. 
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A
whom 
B
them 
C
who 
D
which