It’s strange that they＿＿＿＿＿nothing about this matter. A. knowB. would knowC. knowsD. knew

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(答案→)A. know
B. would know
C. knows
D. knew
解析：在It’s important／surprising／desirable／strange／necessary／no wonder／a pity／a shame＋that 从句中，从句谓语动词用（should ） do。