单项选择题

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

A．every speaker
B．must
C．himself
D．to
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单项选择题
Nancy had (a great deal) of trouble (to concentrate on) her work (because of) the noise (in) the next room.
A．a great deal of
B．to concentrate on
C．because of
D．in
单项选择题
(Ever since) the world (began) nations (have difficulty) in (keeping) peace with their neighbors.
A．Ever since
B．began
C．have difficulty
D．keeping
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