20. It was already 11 o’clock in the eveningthey arrived at the hotel. A. whenB. before C.

问题补充：

20. It was already 11 o’clock in the eveningthey arrived at the hotel.

A. when

B. before

C. that

D. Since

答案：

(答案→)A. when

B. before

C. that

D. Since

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