He suggested that the work ＿＿＿＿＿ at once. A. be doneB. should do C. could doD. does

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(答案→)A. be done
B. should do
C. could do
D. does
解析：在suggest(建议)，insist(坚持主张)，order，demand等后的宾语从句中，谓语动词用should＋动词原形，should可以省略。