______ the sound on the step, the boy rushed out to see if his mother had come b

题干

______ the sound on the step, the boy rushed out to see if his mother had come back.

A．To hear

B．Hearing

C．Heard

D．Hear

上一题下一题 0.85难度单项选择更新时间:2013-05-31 10:46:49

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