填隙碎石的一层压实厚度，可取碎石最大粒径的（）倍。
A、1.5
B、2.0
C、1.5～2.0
参考答案：C
叙述牛顿万有引力定律。
Look at the pride on Tom's face. He _____ to have been praised by the manager just now. [ ]
A. seemed
B. seems
C. had seemed
D. is seeming
