单项选择题

He never let me () when I need his support.

A. in
B. down
C. off
D. out

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单项选择题
What you are doing () very important in your work.

A. seemed
B. seems
C. seem
D. is to seem
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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