when表示转折吗
问题描述：
when表示转折吗
Rick is among the students who have ordinary backpacks with two straps to carry them,____ a number of other students choose rolling backpacks.
A.when B.but C.then D.and
若when不行,while可以吗?
答
有while的话也是可以的,此举有明显的转折关系,故选B.以后又不懂的可以问我.