---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
C

試題分析：句意：--什么時候?qū)＜視䜩斫o我們做關(guān)于經(jīng)濟發(fā)展的講座？--直到我們的項目被批準。這里是not until引導(dǎo)的時間狀語從句，不能用一般將來時，可以用一般現(xiàn)在時代替一般將來時，或現(xiàn)在完成時代替將來完成式，而且program和approve是被動關(guān)系，選C。
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