If ______ a hot bath before sleep, a days tiredness will soon vanish.
A.taking
B.taken
C.to take
D.you take
解题思路:由于该句主句的主语是a days tiredness,不可能发出take a hot bath的行为,故不能采用省略,答案应为D.
在if / when / whether + it is necessary, possible, convenient, important, applicable 等结构时,则省去 it is, 只保留 necessary, possible, convenient, important, applicable等,这是习惯,例如:
Take the medicine when necessary.
注意:英语中一般不能说:you are necessary / convenient / possible/ important等,例如不能说: Take this medicine when you are necessary, 或Come when you are convenient.
3)what, when, whether, how等 + to do 的省略形式,例如:
You are a college student now;you should know what to do and what not to do.
The train leaves at midnight, but at present we have not decided whether to take the trip.
但是:why do, 中间不用 to 连接,例如:
Why not go and ask the teacher for help?
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