单项选择题

The inflation made it hard for us to buy the necessities（）.

A.which need us
B.that we need
C.what we need
D.as we need

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单项选择题
_____from the moon，the earth with water _____seventy percent of its surface.（）

A.See/covered
B.Seeing/covering
C.Seen/covering
D.To see/to cover
单项选择题
The person _____ you were talking to was an American.（）

A. who
B. whom
C. which
D. as
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