题干
The boss made him work 14 hours a day.That means,he _______ work 14 hours a day.
A：was made
B：made
C：was making
D：was made to
答案(点此获取答案解析）
D
，定义一种向量积：
＝(a1b1，a2b2)．已知点
，
＝，
＝，点Q在y＝f(x)的图象上运动，满足
＝
＋