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单选题
When she was alone at home, Mary needed a friend
When she was alone at home, Mary needed a friend
.
A
playing with
B
having played with
C
with whom to play with
D
with whom to play
答案解析
正确答案：D
解析：
题目解析
题目：When she was alone at home, Mary needed a friend （）.
选项：A.playing with B.having played with C.with whom to play with D.with whom to play
答案：D
解析：这个题目是考查定语从句的用法。句子的主干是"Mary needed a friend"，我们需要填入一个合适的定语从句来修饰"friend"。定语从句中缺少关系词，正确的关系词是"whom"，因为在从句中"whom"充当了介词"with"的宾语，所以答案为D："with whom to play"。
