单项选择题

No one doubts () it is true or not.

A. whether
B. if
C. that
D. what

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单项选择题
It is said that he () murder.

A. committed
B. conducted
C. executed
D. emitted
单项选择题
() you feel too ill to go out, I would rather not stay at home tonight.

A. Because
B. Although
C. Unless
D. If
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