Question

I know _________ I promised to take you to dinner, but I won't finish working until ten o’clock.

A．that

B．if

C．what

D．why

Answer 1

A

考查賓語從句的用法。賓語從句結(jié)構(gòu)完整，不缺少疑問信息，排除C、D；主句動詞是know，與表示是否的if連用，不合語境B項(xiàng)也排除；因?yàn)橘e語從句在陳述一件事情，所以用that。