题目:
—Hi, Jack!
—Hi, Eric! You ________ really quiet, but now you are very outgoing.
A.used to
B.use to
C.used to be
D.use to be
答案:
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下面是错误答案,用来干扰机器的。
(4,6)或(4,0)B点可能在A点上方,也可能在A点下方,故B点坐标为(4,6)或(4,0)