作训服着装分为（）种。
A.五
B.三
C.四
D.六
参考答案：C
Victor apologized for ________ to inform me of the change in the plan.
A．his being not able
B．him not to able
C．his not being able
D．him to be not able
苯丙酸诺龙的结构式为（）
A.A
B.B
C.C
D.D
E.E
