请说出三种糖料作物。
参考答案：
甘蔗、甜菜、甜高梁
一个直角三角形的一个锐角是43°，它的另一个锐角是______．
—I felt it very difficult to carry on the work all by myself.
—I could have helped you, but you _____me to.
A．hadn’t asked
B．didn’t ask
C．haven’t asked
D．don’t ask
