问题补充:
He is believed in at his office on his way home.
A. dropping
B. to have dropped
C. having dropped
D. to be dropped
答案:
A. dropping
(答案→)B. to have dropped
C. having dropped
D. to be dropped
解析:首先be belived to do是固定用法;drop in at接地点表示拜访某地。
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