单项选择题

The USA is composed of 50 states, () are separated from the others by land or water.

A. two of these
B. of whom two
C. two of which
D. two of that

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单项选择题
Linda has lost her wallet again. It is the second time this ().

A. has happened
B. happened
C. happen
D. was happened
单项选择题
No one imagined that the apparently () businessman was really a criminal.

A. respectful
B. respective
C. respectable
D. respecting
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