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a for which b of which c where d with which 选什么 为什么 考查什么语法 缺

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a for which b of which c where d with which 选什么 为什么 考查什么语法 缺少什么成分
people in the earthquake-stricken areas are faced with lots of problems ,______the lack of the shelter is the most serious
答案选 b of which

从句是为了补充说明主句中的 problem,缺的是一个连词.
which 前面加介词,如何选?

因为 which 就是指代 problem 的,
介词就取决于这里和 problem 的衔接了,是 of problem ,for problem 还是 with problem?

看句尾可知, the most serious ____ (all) the problems 该填什么介词,就是 which 前必须加的介词.