> 英语 >
it is necessary for us_both reading and writing
A.learningB.learnedC.learnD.to learn
选哪个,理由
人气:279 ℃ 时间:2020-04-05 05:34:47
解答
D 因为 is 是助动词,learn是动词,助动词与动词之间用to相连
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