The missing boys were last seen _____ near the river.A．playingB．to be playing C．

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The missing boys were last seen _____ near the river.

A．playing

B．to be playing

C．play

D．to play

答案

解析

现在分词作主语补足语，表示进行。

举一反三

The servant did _____ she could ______ the revolutionary.

A．what, help

B．that, to help

C．what, to help

D．all help

题型：不详难度：| 查看答案

Though ______, many laws of nature exist.

A．not having been discovered	B．having not been discovered
C．not having discovered	D．having not discovered

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—You were brave enough to raise objection at the meeting.
—Well, now I regret ________ that.

A．to do	B．to be doing
C．to have done	D．having done

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—The light in the office is still on.
—Oh，I forgot ________.

A．turning it off	B．turn it off
C．to turn it off	D．having turned it off

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In some parts of London, missing a bus means ________ for another hour.

A．waiting	B．to wait
C．wait	D．to be waiting

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