—How long will you graduate from senior middle school?
—It will be less than one year________I graduate.
A．when　B．that
C．beforeD．since
C
考查狀語(yǔ)從句。這里before引導(dǎo)時(shí)間狀語(yǔ)從句，此處“It will be＋一段時(shí)間＋before...”，表示“還有多久就”，還有不到一年時(shí)間我就要高中畢業(yè)了。
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