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

分析 我们两群人应该分开,这非常必要.

解答 答案:Bit is+形容词+that从句,从句中要用should+动词原形,should可以省略;常用的形容词有essential,important,necessary,natural,funny,strange,surprising,astonishing等,是常用的句式虚拟.故选B.

点评 "It is+形容词+that…"句型.常见的形容词有important,necessary,natural,funny,strange,surprising,astonishing等.谓语动词通常用"should+动词原形",should可省略.

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