The United States (is composed) of fifty states, (two of those) are (separated from) (the others) by land or water.

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问题 The United States (is composed) of fifty states, (two of those) are (separated from) (the others) by land or water.

选项 A、is composed
B、two of those
C、separated from
D、the others

答案B

解析 应改为two of which。非限定性定语从句,which在从句中指fifty states。
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