do you know ___ when they meet?1 what they do2what do they do3whai they did4 what did they do

问题描述:

do you know ___ when they meet?
1 what they do
2what do they do
3whai they did
4 what did they do

选1 what they do

选1.首先时态是一般现在时.去掉2.4又因为要用陈述句语序.所以是what they do.
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