It was very kind of you to clean the office,though you C_.为什么选didn't have to?

It was very kind of you to clean the office,though you C_.为什么选didn't have to?
选needn't do 难道不是‘虽然你“不必做”的意思吗?’
英语人气:134 ℃时间:2020-01-29 05:45:13
优质解答
needn't 是一般时态,不能表现出过去时的含义,didn't have to 是过去时,正确.
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