10．---When will the expert come and give the lecture on economic development？
---Not until our program_______．（　�。�
A．is approvingB．is to approve
C．has been approvedD．will be approved

分析 ---什么時候專家來給我們做關于經(jīng)濟發(fā)展的講座？
--直到我們的項目被批準．

解答 答案選C
這里是not until引導的時間狀語從句，不能用一般將來時，可以用一般現(xiàn)在時代替一般將來，或現(xiàn)在完成時代替將來完成式，而且program和approve是被動關系，故選C．

點評 本題答案選項中A．B為主動語態(tài)，C．D為被動語態(tài)，所以要先確定本題的語態(tài)．由于program和approve是被動關系，故用被動語態(tài)；而not until引導的時間狀語從句，不能用一般將來時，所以答案只能選has been approved．

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