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— Why didn’t they complete the task in time?
— Because it was not until late afternoon _____ they began to solve the major problem．
A．whenB．thatC．beforeD．which
B
考查強(qiáng)調(diào)句型。此題是一個含有not until 的強(qiáng)調(diào)句型，其結(jié)構(gòu)為：it is/was + not until +其它+ that,下一個句子意思為：因?yàn)榫褪窃谙挛缤硇⿻r(shí)候他們開始解決這個主要的問題。所以選B。
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