摘要： I didn’t manage to do it you had explained how. A. until B. unless C. when D. before 答:A．unless相当于if...not 若选B项.主句应用虚拟句式 I wouldn’t have managed to do it if you had not explained how.项与句意不符．根据主句与从句的时态可排除D项.
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I didn' t manage to do it _____ you had explained how.
A. until B. unless C. when D. before
查看习题详情和答案>>I didn’t manage to do it ______ you had explained how.
A. until B. unless C. when D. before
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I didn’t manage to do it _____ you had explained how.
A. until B. unless C. when D. before
查看习题详情和答案>>