成人英语三级考试

【单选题】The chairman proposed that (every speaker) (must) limit (himself) (to) fifteen minutes.
A．every speaker
B．must
C．himself
D．to

网考网参考答案：B
网考网解析：
应改为should．Lest“以防”，后面要加should的虚拟语气，should可以省略。 查看试题解析出处>>