The teacher __________ , they went on with their discussion.

A．leaving

B．bring left

C．was leaving

D．having left

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参考答案

【译文】老师离开后，他们继续进行讨论。
【解析】本题考查独立主格结构辨析。leave与teacher构成逻辑上的主谓关系，故用现在分词，由于老师离开的动作在前，所以用having done表示动作先后关系。故选D。

1 Seeing her father come back, __________.

A．tears ran down her cheeks

B．her tears ran out

C．she burst into tears

D．tears burst into her

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2 __________ singer and __________ dancer is also good at drawing.

A．The; a

B．The; the

C．A; a

D．The;/

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3 It' s such a difficult problem __________ no one can work it out.

A．as

B．that

C．so

D．thus

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