【題目】Seeing their teacher _______ into the classroom, they stopped _______ at once.

A．walk; telling B．entering; to speak

C．enter; to tell D．walking; talking

【答案】D

【解析】

試題解析：

句意:看到老師走進教室,他們立刻停止了談話。see sb doing sth：看見某人正在做某事；see sb do sth:看見某人做過某事。stop doing sth ：停止正在做某事；stop to do sth:停下來去做另一件事情。故選D

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