语法与词汇
Not until a tractor started working in the next field _____ conscious of his far from icy surroundings.
A、
he became
B、
did he become
C、
he had become
D、
had become
【正确答案】
B
【答案解析】
句意： 他直到拖拉车去下一个区工作才意识到自己已经远离了冰天雪地。 not until放在开头句子要倒装， 故选B。
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