Jenny didn't have time togo to concert last night because she was busy_____ for her examination.
问题描述：
Jenny didn't have time togo to concert last night because she was busy_____ for her examination.
A:preparing B:to be prepared
C:to prepare D:being prepared
答
a
忙於做什麽事：be busy (in) doing
preparing for sth为某事做准备/准备某事