He has no idea what the book is about．He        have read it very carefully．
A．needn’tB．shouldn’tC．can’tD．mustn’t
C
情態(tài)動詞辨析。A．不必；B．不應(yīng)該；C．不能；不可能   D．禁止。句意：他不知道這本書是關(guān)于什么的。他不可能認(rèn)真的讀完它了。選C。
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