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定语从句练习：
The only thing ___ we could do was to ask the police station for help.
A. what B. that C. which D. as
2. The Great Wall is the last place ___ Mr. Smith is going to visit before he leaves Beijing.
A. where B. which C. / D. what
The only thing ___ we could do was to ask the police station for help.
A. what B. that C. which D. as
2. The Great Wall is the last place ___ Mr. Smith is going to visit before he leaves Beijing.
A. where B. which C. / D. what
