单项选择题

Please do net hesitate to call me if I can be of further assistance.

A．contact
B．see
C．help
D．touch
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单项选择题
I am not certain whether he will come.
A．determined.
B．sure
C．sorry
D．glad
单项选择题
Can you follow the plot so far
A．change
B．investigate
C．write
D．understand
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