10．It is essential that the two groups_____ kept separate．（　�。�
A．can beB．should beC．must beD．will be

分析 我們兩群人應該分開，這非常必要．

解答 答案：Bit is+形容詞+that從句，從句中要用should+動詞原形，should可以省略；常用的形容詞有essential，important，necessary，natural，funny，strange，surprising，astonishing等，是常用的句式虛擬．故選B．

點評 "It is+形容詞+that…"句型．常見的形容詞有important，necessary，natural，funny，strange，surprising，astonishing等．謂語動詞通常用"should+動詞原形"，should可省略．

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