Traveling by air may be quicker , but not so (cheap)/(cheaper). 选择

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Traveling by air may be quicker , but not so (cheap)/(cheaper). 选择

Traveling by air may be quicker , but not so (cheap)/(cheaper). 选择
Traveling by air may be quicker , but not so (cheap)/(cheaper). 选择

Traveling by air may be quicker , but not so (cheap)/(cheaper). 选择
cheap, 如果没有 so 的话 cheaper 也可以

cheap

so, such后都是接动词原形的 这个老师肯定讲过啦~~~