单选题
37.
Not until he retired from teaching three years ago ______ having a holiday abroad.
A、
he had considered
B、
had he considered
C、
be considered
D、
did he consider
【正确答案】
D
【答案解析】
直到三年前他教书退休了，他才考虑出国度假。本题考查特殊句式。Not until引导的状语从句位于句首时，主句要用部分倒装，需将助动词提前；且由three years ago可知用一般过去时，故选D项。
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