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
单项选择题
The salary of an engineer is much higher ______.
A．than a teacher
B．than that of a teacher
C．in comparison with a teacher's
D．than of a teacher's
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