The flowers his friend gave him will die unless___every day.A．wateredB．wateringC

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The flowers his friend gave him will die unless___every day.

A．watered	B．watering
C．water	D．to water

答案

解析

unless后接省略形式。flowers和water之间是关系要用被动语态。同时unless从句的主语与主句的主语相同，常常省略其相同成分，故选A项，表示被动。动词-ing形式表示主动；不定式常用作目的状语。

举一反三

Only when the govern

ment increases affordable homes for low-income groups .

A．the imbalance of demand and supply can be removed

B．can be removed the imbalance of demand and supply

C．can be the imbalance of demand and supply removed

D．can the imbalance of demand and supply be removed

题型：不详难度：| 查看答案

Not until________,_________.

A．did she take off, I realized	B．she took off, did I realize
C．did she take off, did I realize	D．she took off, I realized

题型：不详难度：| 查看答案

Only in that way ______ the challenges and opportunities in life.

A．we will be ready for	B．were we ready for
C．will we be ready for	D．we were ready for

题型：不详难度：| 查看答案

Generally speaking, according to the directions, _____ the drug has no side effect.

A．when taken

B．when taking

C．when to take

D．when to be taken

题型：不详难度：| 查看答案

So sudden _____ that the enemy had no time to escape.

A．did the attack

B．the attack did

C．was the attack

D．the attack was

题型：不详难度：| 查看答案