it was ______ he was injured that he failed in the competition. a because b as c since d for

问题描述:

it was ______ he was injured that he failed in the competition. a because b as c since d for
选哪个啊?能告诉原因吗,我只知道这是个强调句

答案:a
翻译:因为他受伤了,所以他输了比赛
解析:虽然四个选型都有因为的意思,但是强调句只能用because .那能告诉我为什么B C D 不能选吗已经说了 强调句型中,四个选项【只能】用because。语法规定的