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单选题回答第21空。

参考答案:C进入在线模考
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2Why did Brett decide to try to produce the Rainaway map?

A.He was assured that it was better than existing products of that typ
B.He could see a way of manufacturing it reasonably cheapl
C.I-le was unable to buy anything similar himsel

3When he started to develop Rainaway, Brett was confident of his knowledge of

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