语音知识。从下列每组单词中找出一个划线部分不同于其他三个的选项。
---How will you go to the zoo tomorrow? ---If it ______ tomorrow, I’ll go there by car．
While Helen ________ the piano，her mother came in．
The shorts are _________ of all, but they are _________．
The room was dark，_________ I turned on the lights．
----________ have you been studying at school? ----For more than four years．
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