单项选择题

All who completed the voluntary__________ on Friday will receive a certificate recognizing their participation.

A．train
B．trained
C．training
D．trainable

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热门试题

单项选择题To remove jammed paper from the printer，（）lift up the plastic panel and press the button marked Jam .

A．simplify
B．simple
C．simply
D．simplistic

单项选择题William was pleased to see the executives respond so__________ to the proposal he had been working on.