--- Tommy, your mum has been out without glasses!
--- Well, take it easy. _______ she is back home for them.
A．It is long before thatB．It won’t be long since
C．It won’t be long beforeD．It will be long before
C

試題分析：考查固定句式。固定句式：It be 一段時間 before…一段時間以后某事才發(fā)生；如果before后面使用一般現(xiàn)在時，前面的主語使用將來時；如果before后面使用一般過去時，前面也使用一般過去時；本題橫線后面使用了一般現(xiàn)在時，前面使用了將來時。句意：—Tommy，你媽媽肯定沒有戴眼鏡就出去了。—不要著急，不就以后她就會回來取眼鏡的。說明前半句應該使用否定句。故C正確。
點評：固定句式：It be 一段時間 before…一段時間以后某事才發(fā)生；如果before后面使用一般現(xiàn)在時，前面的主語使用將來時；如果before后面使用一般過去時，前面也使用一般過去時；
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