i wonder what it was (let he down) 为什么错了 ,答案是that let him do

i wonder what it was (let he down) 为什么错了 ,答案是that let him do he was barking so that someone would let him out I just wonder ______ that makes him so excited.为什么不用what he I told him not to let go, but he said it was time. I felt it necessary to let him know he was wrong （改为近义句） what was it that let you to say that?是什么从句?是强调据句? 是I wonder why it was that … 还是I wonder it was why let's write down what he said let him do it alone,_____? I would never trust him again .He let me down.---___________ let it do what it does意思是“顺其自然”吗? They always let me do ________ I think I should.答案是what