We ________ our hands while they were singing on the stage.A．clapB．have clappedC

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We ________ our hands while they were singing on the stage.

A．clap

B．have clapped

C．were clapping

D．are clapping

答案

解析

while引导的从句常用过去进行时。

举一反三

Try to buy one before all the tickets ________.

A．will be sold

B．will be sold out

C．are sold

D．are sold out

题型：不详难度：| 查看答案

About 500 cars ________in the factory last month.

A．were produced

B．are produced

C．produce

D．produced

题型：不详难度：| 查看答案

—Is your father in ?—No, he _______ for three days.

A．was out

B．has been out

C．went out

D．have gone out

题型：不详难度：| 查看答案

—How long have you lived here?
—Since I _________.

A．married

B．got married

C．married to my wife

D．married with my wife

题型：不详难度：| 查看答案

—He’s stopped from smoking , ________he?
—Yes, he ________ stopped smoking.

A．hasn’t , is

B．isn’t , is

C．isn’t , has

D．has, is

题型：不详难度：| 查看答案