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Itwas____hismothercamein____topreparehislessons.A.notuntil;didtheboybeginB.until;thattheboybeganC.until;didtheboybeginD.notuntil;thattheboybegan答案选D为什么不能选A呢
题目内容：
It was____his mother came in____to prepare his lessons.
A.not until ; did the boy begin
B.until ;that the boy began
C.until ;did the boy begin
D.not until ;that the boy began答案选D为什么不能选A呢优质解答
强调句型.it is/was ...that...固定搭配
A.not until ; did the boy begin
B.until ;that the boy began
C.until ;did the boy begin
D.not until ;that the boy began答案选D为什么不能选A呢
优质解答
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