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A．They are very rewarding.
B．They are too time-consuming.
C．They are not helpful at all.
D．They are too troublesome.
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单项选择题
A．William Smart.B．Mrs. Dodd.C．President Lyndon Johnson.D．President Nixon.
A．William Smart.
B．Mrs. Dodd.
C．President Lyndon Johnson.
D．President Nixon.
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