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几个语法问题canada has one third of the world's total fresh water,

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几个语法问题
canada has one third of the world's total fresh water,___is in the Great Lakes.
A much of it B much of which C much od what D much of that 为什么选B?
the floor is awfully wet.what happened?No sooner____into the shower than the phone rang.
A I had got B had I got
C did I get D I have got 为什么选B?
第一题,water后边的逗号明显的表示出这个逗号后面的句子是定语从句,而且还是非限定定语从句,而非限定定语从句只能由which 引导.
第二题,no sooner...than位于句首所引起的倒装句为部分倒装形式,如果谓语动词为be的一般现在时或一般过去时,则为完全倒装形式.另外,分析句子可以发现,got into shower 发生在phone rang 之前,而phone rang都是过去时,发生在过去,由此shower发生在过去的过去,所以用过去完成时.所以选B.