题目内容

【B12】

A. in
B. on
C. by
D. at

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【B3】

A. find out
B. learn
C. discover
D. work out

【B15】

All at once
B. At once
C. Immediately
D. All suddenly

【B11】

A. so
B. that
C. so that
D. in order that

A．peopleB．passengersC．officialsD．travelers

A. people
B. passengers
C. officials
D. travelers