题目内容

(No) one (knows) (that) the experiment will succeed (or not).

A. No
B. knows
C. that
D. or not

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A typical English gentleman often takes an umbrella with him.

He is an (experienced) businessman; he has (engaging) in foreign (trade) for a few (years).

A. experienced
B. engaging
C. trade
D. years

I"d like to make an appointment with Dr. Smith.

不敲门就进屋是不礼貌的。