Not only ________ to us the importance of learning the English language but they also told us the best way to learn it．A.did they explainB.they explainC.had they explainedD.they explained
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A解析not only…but also 所连接的两个分句时态要一致，当not only置于句首，not only 分句主要用倒装形式，由but分句的时态可知应选A项。