do you know that/if--do you know ( ) we will arrive this afternoon?--I am afraid we will be late.a)that b)if3kyou

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doyouknowthat/if--doyouknow()wewillarrivethisafternoon?--Iamafraidwewillbelate.a)thatb)if3kyoudoyouk

do you know that/if--do you know ( ) we will arrive this afternoon?--I am afraid we will be late.a)that b)if3kyou
do you know that/if
--do you know ( ) we will arrive this afternoon?
--I am afraid we will be late.
a)that b)if
3kyou

do you know that/if--do you know ( ) we will arrive this afternoon?--I am afraid we will be late.a)that b)if3kyou
b.由答句可知问句问的是“是否知道”.而that在句中意思会是“知不知道”

If,问者明显是不知道下午会不会到达而提出问题。用That说明提问者是确定下午能到达的

选择B
因为回答是我恐怕我们会迟到,就是回答提问者是否在下午到达的问题。如果选that,那回答就是I know,或I don't know.

B