题目：
At first Bob was puzzled by Virginia s waving, but then it _____ his mind that she was trying to tell him something.
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答案：
A
题目分析：
cross (enter)one's mind 想起：1)A sudden thought crossed my mind. 2)It never crossed my mind that he might refuse the request. (我从来没有想到他可能会拒绝这个请求。)
如用pass through, 例如：When Jane did not come home by midnight, many terrible fears passed through Mother's mind. (="Mother" thought of many things that might have happened to Jane.)
occur的用法如下：1）That view of the case did not occur to me before. (对这个案件的那种看法以前我没有想到过。)2）It occurred to her that she might adopt a homeless child.(她想到，她可以收养一个无家可归的孩子。)
关于"想起"的以上三种表达法考生务必弄懂熟记。这些词组和句形不仅在词汇测试中经常遇到，而且在短文写作时也可以使用。
本题译文：起初鲍玻对弗吉尼亚的挥手致意感到迷惑，但后来他想到，她想告诉他某事。
