--who helped betty tidy up the bedroom just now -- --- she cleaned it all by herselfa\ somebodyb\ nobodyc\ everybodyd\ anybody说理由!

--who helped betty tidy up the bedroom just now -- --- she cleaned it all by herselfa\ somebodyb\ nobodyc\ everybodyd\ anybody说理由!
--who helped betty tidy up the bedroom just now -- --- she cleaned it all by herself
a\ somebody
b\ nobody
c\ everybody
d\ anybody
说理由!

--who helped betty tidy up the bedroom just now -- --- she cleaned it all by herselfa\ somebodyb\ nobodyc\ everybodyd\ anybody说理由!
选择B：nobody


句意是：
刚才谁帮贝蒂整理了房间?
回答：没有人,她自己打扫的.


所以应该是选择：没人,即nobody

B
谁帮他整理房间了
没人，他自己做的