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问题: 冠词,数词2

p40
88.The Browns were at table when I got there so I sat at ______ table in the sitting-room and wait.
A.a B.the

99.______ of the material for this overcoat is silk.
A.25% B.One fourth of

解答:

88:B。the sitting-room带the作用在于特指“布朗家的起居室”,而非其他人家的。
99:AB都可以。没有那么多繁琐的规矩!