The chairman proposed that (every speaker) (must) limit (himself) (to) fifteen minutes.

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问题 The chairman proposed that (every speaker) (must) limit (himself) (to) fifteen minutes.

选项 A、every speaker
B、must
C、himself
D、to

答案B

解析 应改为should.Lest“以防”,后面要加should的虚拟语气,should可以省略。
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