Do you know -------- when there is a fire?Do you know -------- when there is a fire?A.how to do B.what to doC.what do D.how do

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Do you know -------- when there is a fire?Do you know -------- when there is a fire?A.how to do B.what to doC.what do D.how do
Do you know -------- when there is a fire?
Do you know -------- when there is a fire?
A.how to do B.what to do
C.what do D.how do

Do you know -------- when there is a fire?Do you know -------- when there is a fire?A.how to do B.what to doC.what do D.how do
不管采不采纳,我的回答就在这里
这里选B
这里时考你语法的,不是要你从中文意思出发的
这里因为do 时及物动词,因此后面缺少了宾语,时缺了成分,那就又what 充当,what 既是连词,也时做do 的宾语
而A ,要改成how to do it 就对了

你好，很高兴回答你的问题，正确答案为：
B
how to do 后面要跟宾语才行，
所以是what to do 做什么
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