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
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