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I know _________ I promised to take you to dinner, but I won't finish working until ten o’clock.
A.thatB.ifC.whatD.why
A
考查宾语从句的用法。宾语从句结构完整,不缺少疑问信息,排除C、D;主句动词是know,与表示是否的if连用,不合语境B项也排除;因为宾语从句在陈述一件事情,所以用that。
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