Please let me know ( ) they have time tomorrow afternoon. A. whether B. if C. that D. until需要道理

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Pleaseletmeknow()theyhavetimetomorrowafternoon.A.whetherB.ifC.thatD.until需要道理Pleaseletmeknow()theyha

Please let me know ( ) they have time tomorrow afternoon. A. whether B. if C. that D. until需要道理
Please let me know ( ) they have time tomorrow afternoon. A. whether B. if C. that D. until
需要道理

Please let me know ( ) they have time tomorrow afternoon. A. whether B. if C. that D. until需要道理
B.if

a

A
意思是不知他们有没有时间去
其实if也有同样的意思,但if用在陈述句比较多