16.keep on doing sth.不断地做某事 17.learn to do sth.学会做某事 18.finish doing sth.做完某事 19.promise to do sth.许诺去做某事 20.help sb. to do sth.帮助某人做某事 21.remember to do sth.记住做某事 22.agree to do sth.同意做某事 23.love to do sth.喜...
如:at home、in the school、in the beautiful park、during my happy childhood、over the last few years、for three weeks 【例句】 (After chatting) (with Laura) (on this matter) (for two hours) (from 2:00 to 4:00) (in the afternoon), I returned (to my ...
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