在固定不旋转的制动底板上有（）个支撑销，支撑着两个弧形制动蹄的下端。
A.2
B.4
C.6
D.8
参考答案：A
He left the place, ____ never to return.
A．determined
B．to determine
C．being determined
D．having determined
Tom and his brother ______ a great sports collection.[ ]
A. has
B. do
C. have
D. does
