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
______ he realized it was too late to return home.
A．No sooner it grew dark when
B．It was not until dark that
C．Scarcely it grew dark than
D．While it grew dark that
单项选择题
The other day your cousin came to visit us without giving notice ______.
A．in addition
B．in advance
C．in fact
D．in nature
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