My mother-in-law （who is in her 60s) insists that it be proper etiquette for men to stand
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My mother-in-law (who is in her 60s) insists that it be proper etiquette for men to stand up whenever a woman gets up from or returns to the table.
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正确答案：be—is
insist表示“坚持认为”时，它所引导的that从句中不需要用虚拟语气，只有表示坚持让某人去做某事时，才需用虚拟语气。本句的意思是：年逾六十的岳母坚持认为每当有女士离开餐桌或者回到餐桌时，男士都应该起立，这是一种恰当的礼节。