She felt sorry she had disturbed the ________ calmness of a man she respected．A.regularB.curiousC.usualD.various
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C解析解析：usual“惯常”，例如：This is not my usual work．Playing chess is his usual pastime．拓展：as usual“像以往一样”；than usual“比以往”。As usual, he arrived early．I'm feeling better than usual．