It is not until we know more about the situation ______ we are able to improve it.
A．thatB．whatC．whenD．which
A
 考查強(qiáng)調(diào)句。本句是對(duì)not until引導(dǎo)的時(shí)間狀語(yǔ)從句進(jìn)行強(qiáng)調(diào)。It is not until…that…。                        
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