问题标题：
【IheartheyaregoingtoLondon，butIdon'tknow________theywillstaythere．（）A.howsoonB.howoftenC.howlongD.howfast】
问题描述：
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
陶建武回答：
答案：C howsoon多久；howoften多久一次；howlong多久；howfast多快．根据I don't know ________ they will stay there．我不知道他们要在那儿呆多久．可知应该是指：呆多长一段时间．Howlong一...
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