问题标题：
【Overthelastfewyears，thenumberofstudentsparticipatinginvolunteerprograms_______sharplyinourschool．（）A.wasincreasingB.hasincreasedC.hadincreasedD.increased】
问题描述：
Over the last few years，the number of students participating in volunteer programs _______ sharply in our school．（）
A.was increasing
B.has increased
C.had increased
D.increased
冯春杨回答：
答案：B A．项是过去进行时；B．项是现在完成时；C．项是过去完成时；D．项是一般过去时．由于Overthelastfewyears是现在完成时的标志词，故选B．
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