单选题 9.  —What courses are you going to do next semester?
    —I don't know. But it's about time ______ on something.
【正确答案】 B
【答案解析】 固定句型用法。it is (about) time (that)是一个虚拟语气句型，谓语动词用一般过去式。
   ——你下学期打算学哪些课程?
   ——不知道。不过是做决定的时候了。