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As is natural, a man as old as he ______ be very forgetful.
A．canB．mustC．shouldD．would
A
can通常用來表示“理論上的可能性”，并不涉及到是否真的會(huì)發(fā)生，本句中即是此意，“從自然規(guī)律上來講，象他這樣的老人會(huì)很健忘”。
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