单项选择题

They are talking vigorously about the people and countries ______they had visited.

[A] which
[B] that
[C] what
[D] where
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单项选择题
The main reason for the spreading of the disease isn't so much a fall in living conditions ______a rise in it..
[A] as
[B] like
[C] than
[D] but
单项选择题
Once______, the information superhighway will drastically change the lifestyle of all the residents on this island,
[A] it being completed
[B] it completed
[C] completed
[D] it completes
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