A：内蒙古自治区
B：广西壮族自治区
C：新疆维吾尔自治区
D：西藏自治区
有性生殖对生物的进化有重要意义，下列叙述中不正确的是（ ）
Our teachers have been with us for nearly three years _______ we came to junior high school. We should thank them for what they have done for us.
