单项选择题

The USA is composed of 50 states, ______ are separated form 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
All ______ for your good.
A．what I said was
B．what I said were
C．that I said were
D．that I said was
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
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