It may be quite a long time ________ she is back again, so don't be too cross with her.
A.thatB.sinceC.beforeD.when在线课程C
It was+一段时间before“过了好久才”．It will be+一段时间before“要过好久才”．It is+一段时间since+从句(从句中要用过去时)“自从……以来到现在有多久了”．
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