单项选择题

Joe had many regrets when he ______ the years he spent abroad.

A．looked back on
B．looked down upon
C．looked up to
D．looked out of
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单项选择题
______ from his expression, he is in low spirits.
A．Judged
B．Judging
C．Being judged
D．Having judged
单项选择题
He must have come here yesterday evening, ______ he
A．did
B．has
C．haven't
D．didn't
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