单项选择题


A．ease
B．skill
C．technique
D．difficulty
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单项选择题
A．to rejectB．rejectC．rejectingD．rejected
A．to reject
B．reject
C．rejecting
D．rejected
单项选择题
A．called upB．called onC．called forD．called in
A．called up
B．called on
C．called for
D．called in
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