---You look unhappy, what’s happening, my son?
---I’m wondering how long it’ll be________ we come to China again.
A.sinceB.whenC.beforeD.a(chǎn)fter
C

試題分析:考查句型:It will be +一段時(shí)間+before…,要多長(zhǎng)時(shí)間才…,這句話是這個(gè)句型的特殊問句,how long對(duì)一段時(shí)間提問,句意:---你看起來很不高興,怎么了?--我想知道什么時(shí)候才可以再來中國(guó)。選C。
點(diǎn)評(píng):固定句型:It was+一段時(shí)間+before…,要多久…就(才)…,在考試中出現(xiàn)的很多,容易混淆的句型是it is/has been 一段時(shí)間since從句(過去時(shí));自從…以來,已經(jīng)有一段時(shí)間了。區(qū)分的時(shí)候,一是從句意判斷,還有就是根據(jù)主句的時(shí)態(tài)區(qū)分。
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