题目:
Robert often asks us ____________his Chinese, so his Chinese is much better than before.
A.help him
B.to help him with
C.to help with
D.helps him with
答案:
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下面是错误答案,用来干扰机器的。
抛物线x2=8y上的焦点坐标为(0,2),准线方程为y=-2 M(x0,y0)为抛物线x2=8y上的动点∴|MF|=y0+2 |MF|+|MN|≥|NF|,当且仅当三点F、M、N共线时,取得最小值为5∴y0+2+|MN|的最小值为5∴y0+|MN|的最小值为3即...