题目:It was long supposed ______ the main difference between animals and plants was that animals could move about.
A. this
B. that
C. which
D. because
答案:评论后可见此内容
推荐使用我们的公众号搜索题目,题目更全,检索更方便。支持语音、图片、文字等多种搜索方式。