一般式"to do";完成式"to have done";进行式"to be doing";完成进行
effort n. 努力,尽力 【归纳】 make an effort to do sth.
英语学习 to do sth 1 第1页 (共3页,当前第1页) 你可能喜欢 there be
to do sth 过去常常做某事(现在已经不做了)②be used to do sth 被
辨析used to,be used to do sth,be used to doing sthppt
Tips:Do Not Provide
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