The increasing Apopularity of the motorcycle as a Bconvenience, economical Cform of transportation has been Djust short of astou

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问题 The increasing Apopularity of the motorcycle as a Bconvenience, economical Cform of transportation has been Djust short of astounding.

选项 A、 
B、 
C、 
D、 

答案B

解析 将convenience改为形容词形式convenient,与后面的economical同修饰form。
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