问题
选择题
There were dirty marks on her trousers _______ she had wiped her hands.
A．where
B．which
C．when
D．that
答案
答案：A
此题考查定语从句。由于从句中主谓宾完整，所以只能加状语，而且前面有on her trousers表地点，所以用关系副词where引导定语从句。
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