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---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.after
C

試題分析:考查句型:It will be +一段時間+before…,要多長時間才…,這句話是這個句型的特殊問句,how long對一段時間提問,句意:---你看起來很不高興,怎么了?--我想知道什么時候才可以再來中國。選C。
點評:固定句型:It was+一段時間+before…,要多久…就(才)…,在考試中出現的很多,容易混淆的句型是it is/has been 一段時間since從句(過去時);自從…以來,已經有一段時間了。區(qū)分的時候,一是從句意判斷,還有就是根據主句的時態(tài)區(qū)分。
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