IheartheyaregoingtoLondon,butIdon’tknow

问题详情：

I hear they are going to London, but I don’t know ________ they will stay there.

    A．how soon                                           B．how often

    C．how long                                            D．how fast

【回答】

C

知识点：相似 相近词比较

题型：选择题