东方式插花艺术的造型讲究以（）主枝为骨干，用高低、俯仰以构成不同的形式。
A.3枝
B.4枝
C.5枝
D.6枝
参考答案：A
It was not until she arrived at the classroom she realized she had forgotten her coursebook.
A．and she realized
B．which she realized
C．then she realized
D．that she realized
