— Why didn’t they complete the task in time?— Because it was not until late afternoon the

— Why didn’t they complete the task in time?
— Because it was not until late afternoon they began to solve the major problem．
A. when
B. that
C. before
D. which

A. when(答案→)B. thatC. beforeD. which解析：考查强调句型。此题是一个含有not until 的强调句型，其结构为：it is/was + not until +其它+ that,下一个句子意思为：因为就是在下午晚些时候他们开始解决这个主要的问题。所以选B。

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