It's time to decide what to do and ____A.when to do it B.when to doC.when I should do D.how should I do it【还要把为什么不能选这个答案的原因说一下.】

It's time to decide what to do and ____A.when to do it B.when to doC.when I should do D.how should I do it【还要把为什么不能选这个答案的原因说一下.】
It's time to decide what to do and ____
A.when to do it B.when to do
C.when I should do D.how should I do it
【还要把为什么不能选这个答案的原因说一下.】

It's time to decide what to do and ____A.when to do it B.when to doC.when I should do D.how should I do it【还要把为什么不能选这个答案的原因说一下.】
为你解答.
It's time to decide what to do and （A.when to do it）.
是时候决定要做什么和什么时候做了.
解释：括号中可填宾语从句,或是疑问词加不定式.错误选项分析----
B、when to do：缺少了宾语it.
C、when I should do：也缺少宾语.
D、how should I do it：语序错误,应该是陈述语序,改为 I should 才对.

A,CD都是引导宾语从句应该用陈述语序。，AB 是疑问词加todosth用法，如果不加it，缺宾语，所以选A