Question

9．The Shanghai World Expo will last six months．（對(duì)劃線部分提問）
Howlong will the Shanghai World Expo last？

Answer 1

分析 上海世博會(huì)將會(huì)持續(xù)六個(gè)月．
上海世博會(huì)將會(huì)持續(xù)多久？

解答 答案：How long．劃線部分是時(shí)間段，表示持續(xù)了一段時(shí)間，提問用疑問詞how long多久，故答案是How long．

點(diǎn)評(píng) how long意為"多久、多長(zhǎng)時(shí)間"，主要是對(duì)一段時(shí)間進(jìn)行提問，答語(yǔ)通常是（for）three days/weeks/months等時(shí)間段，它可用于各種時(shí)態(tài)．
How long do you stay in Beijing every year？每年你在北京住多久？
How long have they lived here？他們住在這里有多久了？
-How long were you not at school last year？去年你多久沒上學(xué)？
-About two weeks．約兩周．