when is the last time ___ he saw the parrot.

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when is the last time ___ he saw the parrot.
A、when B、where C、that D、which

C.that（注意：这是个问句,句子应该是“?”而不是“.”）
分析：
A. when —— 可理解为“时”,但句子一开始已经用了,
应避免重复两次.
B. where —— 这是个问词,亦即“哪里”.
一个句子不能出现两个文词,会产生混淆.
这个句子的关键问题是"when".
D. which —— 这是个问词,亦即“哪个”.同B.

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