you ___ take a taxi or the airport bus. A.could B.should C.need

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you ___ take a taxi or the airport bus. A.could B.should C.need

you ___ take a taxi or the airport bus. A.could B.should C.need
you ___ take a taxi or the airport bus. A.could B.should C.need

you ___ take a taxi or the airport bus. A.could B.should C.need
这是根据语境来做的吧,如果表达一种可能性,特别是对过去发生的事情的推测,则选A
如果表达一种moral obligation(比如,上下文说这两种transportation很environmentally friendly,则选B
如果表达一种需要,则选C

选B吧。。。。。。。