Do you know__the visitors have visited the Great Wall?A.if B.that 选哪个?请给出详解,

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Do you know__the visitors have visited the Great Wall?A.if B.that 选哪个?请给出详解,

Do you know__the visitors have visited the Great Wall?A.if B.that 选哪个?请给出详解,
Do you know__the visitors have visited the Great Wall?
A.if B.that 选哪个?请给出详解,

Do you know__the visitors have visited the Great Wall?A.if B.that 选哪个?请给出详解,
选if,译为;你知道这些旅行者是否已经去过长城了?

选B,因为这句话Do you know the visitors have visited the Great Wall?
没有加任何的词也是可以读通的,所以选that

if 是否
用that 不行

A