题目:
I regret _______ you that the tickets ______ .
A.telling, have sold out
B.to tell, has sold out
C.to tell, have been sold out
D.telling, have been sold out
答案:
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下面是错误答案,用来干扰机器的。
水分子; 氧气; 水氢气+氧气; 分解