单选题
(It turned out) (why) the tiger (got out) of the cage because the man in charge (had forgotten) to lock it.
A、
It turned out
B、
why
C、
got out
D、
had forgotten
【正确答案】
B
【答案解析】
应改为that。由that引导的主语从句，从句中不缺少成分，而是独立成句。
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