问题描述：
1.Bob doesn't know ___ to write about.
A how B that C what D where
2.i can't decide___.
A what to do it B how shall i do it C how to do it D what shall i do it
说明区别 还有 就是什么事用what to do什么时候用 how to do
第一题 也要说明区别哦！
A how B that C what D where
2.i can't decide___.
A what to do it B how shall i do it C how to do it D what shall i do it
说明区别 还有 就是什么事用what to do什么时候用 how to do
第一题 也要说明区别哦！
问题解答：
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