题目内容:
Aproblemofthebikehikeschemeonitsfirstdaywasthat______.
A.thebicyclescouldnotbelockedproperly B.peopledidn’tpayfortherentalservice
C.itbroughtrenterssometoothproblems
D.peopledidn’tknowwheretoreturnthebikes
参考答案:
答案解析: