单项选择题

I was just to get up （） a knock was heard on my door.

A.as
B.when
C.while
D.since

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单项选择题
Little （） whether we live or die. We will not make friends with him.

A.cares he
B.did he care
C.does he care
D.cared he
单项选择题
The medicine has many functions, （） are unknown to us.

A.some of which
B.of which some of them
C.that some of them
D.which of them
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