One of the boys ____ my brother. [ ]
A. is
B. are
C. am
D. be
答案：A
前列腺癌血道转移最常见部位
A．脊椎骨
B．股骨近端
C．盆骨
D．肋骨
E．肺
Her math book is _____ the sofa.
A. at
B. of
C. on
D. to
