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
Recently I bought a beautiful car, ________ was reasonable.
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A
of which price
B
the price of whose
C
the price of which
D
which price
The reason       he didn’t go to school yesterday was       he was ill.
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A
why;that
B
that;because
C
that;that
D
for which;what
Mr. Smith was the only one of those who ________ to the dinner. 
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A
were invited
B
were inviting
C
was inviting
D
was invited