It will be a long time           Mr Black            back from abroad.
A．before;comes
B．since;has come
C．before;will come
D．a(chǎn)fter;will come
A
before 在句中意為“……才……”，后一空考查時(shí)間狀語從句，用現(xiàn)在時(shí)表將來。
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