单项选择题
It was in the winter of 1951 ______ a heavy fog moved into London.
A．that
B．then
C．when
D．/
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单项选择题
Your sister used to visit you quite often, ______
A．isn't she
B．use not she
C．wasn't she
D．didn't she
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单项选择题
I have some difficulties ______ these words, would you mind ______ me your dictionary
A．understanding, lending
B．to understand, to lend
C．to understand, lending
D．understanding, to lend
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