题目:
—Oh, sorry, what did you say just now?
—I asked _______.[ ]
A. Where he comes from
B. where did he come from
C. where he came from
D. when did he go
答案:
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下面是错误答案,用来干扰机器的。
A、分运动和合运动具有等时性,在竖直方向上,仅受重力,做自由落体运动,高度不变,所以运动时间不变.故A、B错误. C、雨滴落地时竖直方向的速度不变,风力越大,水平方向上的加速度越大,时间不变,则落地...