48.They will not start the project until the board chairman

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48.They will not start the project until the board chairman _____ back from South Africa.
A.will come
B.is coming
C.came
D.comes
请分析考点及解题思路（对于高手来讲这道题很容易,可对我却是有点难,请回答下其他答案为何不可?）

They will not start the project until the board chairman _____ back from South Africa.
应选：D
译文：他们要等董事长从南非回来,才会启动该计划.
解析：not……until……直到……才……
主将从现,主句用一般将来时（will）,从句用一般现在时（comes）

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