一When did you learn the news that Obama made a trip to Canada as President?一 ___

题型：不详难度：来源：

一When did you learn the news that Obama made a trip to Canada as President?
一 ____ was on my return．

A．That

B．It

C．There

D．This

答案

解析

B根据句意可以得知，问的是时间，it可以指代时间，属于it的实指用法。

举一反三

He didn’t make ______ clear when and where the meeting would be held.

A．this

B．that

C．it

D．these

题型：不详难度：| 查看答案

—Does _____please you to give gifts to others?
—Sure．

A．it

B．that

C．one

D．he

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Though we found _____difficult to avoid economic and financial crisis, we must take measures to reduce its negative impact.

A．it

B．one

C．that

D．how

题型：不详难度：| 查看答案

—Do you think_____ worthwhile to go all the way to Los Angles to buy that computer?
—Well ,I’m going to visit some relatives, too.

A．it

B．/

C．this

D．that

题型：不详难度：| 查看答案

No one knows exactly when our ancestors started talking，but new evidence suggests _______might have happened a long time ago．

A．which

B．what

C．it

D．they

题型：不详难度：| 查看答案