32.Once ______,the clock will last a month and keep good time.A.start B.started C.to start D.starting

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32.Once ______,the clock will last a month and keep good time.A.start B.started C.to start D.starting

32.Once ______,the clock will last a month and keep good time.A.start B.started C.to start D.starting
32.Once ______,the clock will last a month and keep good time.
A.start B.started C.to start D.starting

32.Once ______,the clock will last a month and keep good time.A.start B.started C.to start D.starting
答案:B
此题牵涉到高中英语一个比较重要的语法:状语从句的省略.
1.该语法规定:如果状语从句的主语是it,或和主句主语一样,且从句的谓语动词含有be动词的话,则可以同时把从句的主语和be动词去掉.
这个语法一般运用于时间、条件和让步状语从句.
2.此题即:Once started = Once (the clock is) started 这钟表一旦被启动的话,.
再如:If (I am) invited,I'll go to the party.

我觉得应该选择A

B.这是虚拟语气,需要被动语态。意思是:一旦这个钟可以走动,能过持续一个月并且走势准确。

A

B 省略了一些。完整的是once it is started(一旦被启动),它就……

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