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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