问题补充:
There has been a great increase in bicycle sales this year?
A. does there
B. isn’t there
C. hasn’t there
D. isn’t it
答案:
A. does there
B. isn’t there
(答案→)C. hasn’t there
D. isn’t it
解析:There has been 是There be的完成时,has是助动词,反问形式应用hasn’t there。
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