分类：教育/科学-学习帮助
问题：英语Theboydidn"tgotothezoolastweek 
The boy didn"t go to the zoo last weend because he had a sore back.（改为同义句,每空一词）。The boy didn"t go to the zoo last weekend（    ）（　　　）his sore back.
回答：because of
根据题意，括号里应填的意思是“因为”
as/because/because of/for/by reason of,etc.
因为括号后为his sore back，是短语不是从句，所以选because of不选because，