问题补充：
students have more spare time for their hobbies now.
A. A number of
B. The number of
C. A member of
D. Members of
答案：
(答案→)A. A number of
B. The number of
C. A member of
D. Members of
解析：a number of一些，许多；the number of……的数目。句意：现在许多学生都有多余的时间来进行他们的个人爱好。结合语境可知前文主语为复数形式，故系动词用复数。下文主语number表示抽象含义，故谓语动词用单数，选A。
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