英语：1.He ()drink a lot ,but he gave up three years years ago.

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英语：1.He ()drink a lot ,but he gave up three years years ago.
A.used to B.didn't use to C.was used to D.wasn'tused to 这一题选A,B为什么不行
2.I have four brothers.One is a teacher ,()three are farmers.
A.another B.other C.the other D.others 这一题是C,但是C不是在2者之间用么,我觉得应该选A啊,another+数字是另外的几个
用力骑自行车在水平路面上行驶时,地面对前轮车胎的摩擦力用F1表示,地面对后轮车胎的摩擦力用F2表示,则（）
A.F1和F2的方向均向前 BF.和F2的方向均向后 C.F1的方向向前,F2的方向向后
D.FI的方向向后,F2的方向向前
这题答案是D,说是一个是驱动轮一个是从动轮,但是轮胎行驶方向是一样的,摩擦力也应该是一样的啊?

used to 的意思是过去常常,是固定用法 use to 就没有这个应用,use是及物动词,不能加to
后面虽然是说三个人,但是三个人是一个整体,所以说其实还是两者之间
用力骑自行车,也就是加速运动,后轮摩擦力是自行车的动力,向前自然就不用说了,前轮只是维持平衡用的,“前轮的旋转是因为向前运动,进而才有摩擦力,才旋转的”,楼主带引号的仔细看看,仔细想想,只能解释成这样了,
求采纳

I used to smoke ____ but I gave it up three years ago. Has he been a docture for three years ago? 英语改同义句...1.He joined the Party three years ago.He______ ____ 懂英语请进Tony worked in a lawyer's office years ago,but he is no He said he ____(go) to Beijing three years ago. He drives much ________than he did three years ago. He drives much（）than he did three years ago he worked here three years ago用since three years ago改写句子 He came to China three years ago,so he ---in China A used to He ( ) for three years. He lived in a house____100 years ago. he worked in a lawyer's office years ago ,but he is now work