单选题
The increasing
popularity
of the motorcycle as a
convenience
, economical
form
of transportation has been
just short
of astounding.
A、
popularity
B、
convenience
C、
form
D、
just short
【正确答案】
B
【答案解析】
[解析] 将convenience改为形容词形式convenient，与后面的economical一同修饰form。
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