William found some dirty dots in his coat he had wiped his hands．A.whereB.whenC.
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William found some dirty dots in his coat _________ he had wiped his hands．
A.where
B.when
C.which
D.before
试题答案
A
William found some dirty dots in his coat _________ he had wiped his hands．
A.where
B.when
C.which
D.before
A