主要作用于M期的抗癌药（）。
A.氟尿嘧啶
B.长春新碱
C.环磷酰胺
D.泼尼松龙
E.柔红霉素
参考答案：B
()形式目前被国际承包市场广为采用。
A.总承包合同
B.成本合同
C.成本加酬金合同
D.单价合同
Peter has been busy these days and seldom ________ to come over to have a chat with me.
[ ]
A. doesn't he have time
B. does he have time
C. he has time
D. he hasn't time
