单项选择题

______I was going out, it began to rain.

A. When
B. While
C. As
D. Since
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This pocket book gives ______ information about how to make a bookshelf on your own. A) spacious C) specific B) critical D) crucial
单项选择题
He was praised for______sueh a contribution to the country.
A. make
B. to make
C. to making
D. having made
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