__________ caused the accident is still a complete mystery.A．What B．That C．How

题型：不详难度：来源：

__________ caused the accident is still a complete mystery.

A．What

B．That

C．How

D．Where

答案

A

解析

此题考查what引导名词性从句作主语。

举一反三

It worried Mary a lot__________she would pass the college entrance examinations.

A．whether

B．if

C．that

D．how

题型：不详难度：| 查看答案

Shanghai has taken on a new look.It isn’t like__________it used to be.

A．what

B．how

C．that

D．which

题型：不详难度：| 查看答案

__________ is no possibility__________Bob will win the first prize in the match.

A．There;that

B．It;that

C．There;whether

D．It;whether

题型：不详难度：| 查看答案

Little Tommy was reluctant to tell the schoolmaster__________he had done the day before.

A．that

B．how

C．what

D．where

题型：不详难度：| 查看答案

The old man smiled when he saw how pretty__________up to be during the past few years.

A．had his daughter grown	B．would his daughter grow
C．his daughter would grow	D．his daughter had grown

题型：不详难度：| 查看答案