I can think of many cases         students obviously know a lot of English words and expressions but couldn’t write a good essay.
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A
why
B
which
C
as
D
where
推荐题目
Last Monday, I bought a second-hand computer, ______ was very slow.
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A
which price
B
its price
C
the price of whose
D
the price of which
At the party,John made up a joke,________ people burst out laughing. 
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A
on which
B
by which
C
at which
D
from which
Is this the reason       at the meeting for his carelessness in his work?
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A
he explained
B
what he explained
C
how he explained
D
why he explained