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  3. I am worried about my brother. I am not sure______he has arrived at the school or not.

I am worried about my brother. I am not sure______he has arrived at the school or not.

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问题 I am worried about my brother. I am not sure______he has arrived at the school or not.
选项 A、whether
B、what
C、when
D、how
答案A
解析 分析句子结构可知，sure之后是一个宾语从句。从句成分完整，但意义不完整，所以空处应用whether，与or not构成固定搭配，意为“是否”。what在宾语从句中常作主语、宾语、表语等成分；when在宾语从句中作时间状语；how在宾语从句中作方式状语，均不符合题意。
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