Mike ______have stolen the money from the bank,______he appeared to be rich overnight.
A．can’t; forB．might; forC．must; sinceD．can’t; since
B

試題分析：考查情態(tài)動詞+have done和連詞的用法：句意：邁克可能從銀行偷錢了，因為他好像一夜暴富了。For和since都有“因為”的意思，for用于“推測”，since是“既然”，表示說話雙方都知道的理由。這句話是推測他偷銀行的原因，所以用for，can’t have done不可能做…，must have done過去一定做了，might have done過去可能做了，這里只是有這種可能，選B。
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