There were dirty marks on her trousers _____ she had wiped her hands.

A. where
B. which
C. when
D. that
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科目:高中英語(yǔ) 來(lái)源:高考真題 題型:單選題

There were dirty marks on her trousers _____ she had wiped her hands.
[     ]
A. where
B. which
C. when
D. that

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