(2013·吉林市期末，33)I'm told that languagepractising.com is a free website ________ learners can not just learn various languages but also chat online.
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A
where
B
which
C
that
D
what
推荐题目
_____was expected, he broke his promise once more, ______left his friends down.
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A
It; which
B
As; which
C
It; as
D
Which ;which
The time _________ I first spend with Nelson Mandela was a very difficult period of my life.
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A
when
B
which
C
of which
D
at which
Encouraged by my science teacher, I set about my studies on developing my product, _____I hope I will succeed in applying for a patent（专利）.
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A
with whom
B
to whom
C
through which
D
for which
Mr.Smith is the only one of those foreigners who ______ in China．
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A
work
B
is working
C
are working
D
had working