---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(diǎn)評：固定句型：It was+一段時間+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 一段時間since從句（過去時）；自從…以來，已經(jīng)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(jù)主句的時態(tài)區(qū)分。
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