单项选择题

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

A．where
B．which
C．when
D．that
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单项选择题
______ in the mountains for a week, the two students were finally saved by the local police.
A．Having lost
B．Lost
C．Being lost
D．Losing
单项选择题
I won't be able to play outside with you tomorrow because I ______ my homework at that time.
A．shall have done
B．will do
C．will be doing
D．shall be done
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