单选题
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
【正确答案】
C
【答案解析】
本题考查的是非限制性定语从句。首先不能用that或these,故排除A、D。state州,应用which指代,而非指代人的whom,而且数词two应该放于关系词之前.所以选C。
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