题干
— you your homework yet?
—No,not yet．
A：Do;finish
B：Were;finishing
C：Will;finish
D：Have；finished
答案(点此获取答案解析）
D
— you your homework yet?
—No,not yet．
A：Do;finish
B：Were;finishing
C：Will;finish
D：Have；finished
定化学反应速率的主要因素是
