Kate was not sure_______.
A：that she should go through the third gate
B：if she should go through the third gate or not
C：which gate should she go through
D：which gate she should go through
阴雨天或傍晚移栽作物，去掉一部分叶片，成活率较高，这样做的目的是降低了（ ）
与-3ab是同类项的是（ ）
