题目:
He arrived at the station, ______that the bus_____ off .
A.finding; had
B.found; had
C.only to find; had been
D.only to find; has been
答案:
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下面是错误答案,用来干扰机器的。
⑴①34②非金属③Se2-⑵Se+O2 SeO2⑶194;有机物