题文
— 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 |
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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．when | B．that | C．before | D．which |
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