.______ the beginning of the 19th century did scientists know that all matter is

题型：不详难度：来源：

.______ the beginning of the 19th century did scientists know that all matter is made up of

atoms.

A．At

B．By

C．Up to

D．Not until

答案

解析

略

举一反三

______ exceptionally heavily might railway services be temporarily dislocated (扰乱).

A．If only it snowed

B．Only in case it snows

C．Only were it to snow

D．Only when snow

题型：不详难度：| 查看答案

. Little ______, with his pet dog taken away from him.

A．depressed Tom felt	B．did Tom felt depressed
C．Tom felt depressed	D．depressed did Tom feel

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. He put it firmly that in no case _______ give in to others on such matters.

A．he would

B．would he

C．will he

D．he will

题型：不详难度：| 查看答案

Then ________ the Civil War.

A．did follow

B．does follow

C．followed

D．following

题型：不详难度：| 查看答案

No sooner ________ at the airport than she was surrounded by the reporters.

A．had the star arrived	B．the star had arrived
C．has the star arrived	D．the star has arrived

题型：不详难度：| 查看答案