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
Where did you get your watch ______
A．repair
B．to repair
C．repaired
D．repairing
单项选择题
He didn't come yesterday. He ______ busy working in the lab.
A．must be
B．would have been
C．must have been
D．would be
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