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
The next moment, ______ she had time to realize what was happening, she was hit over the head.
A．when
B．before
C．since
D．as
单项选择题
Without the worker's help, Sam ______ so much progress.
A．would not make
B．would not have made
C．will not make
D．did not make
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