单项选择题

______ most of the earth's surface is covered by water, fresh water is very rare and precious.

A. As
B. Once
C. If
D. Although

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单项选择题

I didn't know which was the better, so I took them______.

A. all
B. each
C. none
D. both

单项选择题

I couldn't understand why he pretended ______ in the bookstore.

A. to see me not
B. not to see me
C. not see me
D. to see not me

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