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?

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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?
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?

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?
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.

表示转折的是but,应选B