因为有明确的表示过去的时间yesterday afternoon,所以用一般过去时,这样可以排除a,c
certain的用法是：
1、be certain that
2、 be certain to
如果d 的certain后加了to,那么它也是对；没加就不对,所以不能选.
这样就只有b是正确答案了.
i （） have left my glasses on the desk of school libery yeste
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