问题补充:
单选题Whileyouaredoingmathexercise,putacalculator(计算器)____tohelpyou.A.in handB.at handC.by handD.on the hand
答案:
B解析at hand在手边 in hand在控制中 by hand用手。
时间:2018-08-31 06:03:45
单选题Whileyouaredoingmathexercise,putacalculator(计算器)____tohelpyou.A.in handB.at handC.by handD.on the hand
B解析at hand在手边 in hand在控制中 by hand用手。