问题补充:
单选题Startstudyingearlyanddon’tstudytoomuch.A.at one timeB.at a timeC.at timesD.from time to time
答案:
B解析at a time 一次;at one time曾经,一度。at times=from time to time有时候。
时间:2020-02-16 06:37:24
单选题Startstudyingearlyanddon’tstudytoomuch.A.at one timeB.at a timeC.at timesD.from time to time
B解析at a time 一次;at one time曾经,一度。at times=from time to time有时候。