{01}_______ you work hard, you won’t solve this problem. A.Even B.As C.Unless D.Since 解析:Even即使,甚至;As因为,由于;Unless除非……否则,如果不;Since 自从,因为。句意:除非你努力学习,否则你不能解决这道题。所以选C。 本题选C。 {02}___you understand this rule, you will have no further difficulty. A.Once B.At once C.Only D.Only then 解析: 本题选A。
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