There is a natural phenomenon scientists call the greenhouse effect.
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that
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what
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for which
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who
推荐题目
The Internet is a very useful invention for us, ______ we can do lots of things at home.
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with which
B
with it
C
for which
D
for it
The college has developed an on-line system ________students can choose their own professors.
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where
B
when
C
that
D
which
He made another wonderful discovery, _______ of great importance to science.
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which I think is
B
which I think it
C
which I think it is
D
I think which is
“Youth” is regarded by many people as a time in their life _____ fun, passion, and imagination seem limitless.
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that
B
which
C
when
D
where