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You _________ be hungry yet;you had a big cake only an hour ago.?
A．may not　B．mustn’t　C．can’t　D．needn’t ?
C?
本題主要考查情態(tài)動詞的用法。根據(jù)后面句子中的had a big cake only an hour ago可知,前面句子是表示對情況的很有把握的推測,即“你一定不怎么樣”“一定不”表推測時用can’t而不是mustn’t。故選C。
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