______ hearing his father is dead,he feels very sad.

A. At
B. In
C. Upon
D. To
C
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科目:高中英語(yǔ) 來(lái)源:0110 期中題 題型:單選題

______ hearing his father is dead,he feels very sad.
[     ]
A. At
B. In
C. Upon
D. To

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