1.I'm beginning to think whether my grandmother was right when she complains , _______ she frequently does, that children nowdays aren't as well-behaved as they used to be .A. since B. as C. which D. because 答案选B, 解释为插入语,但是我看不懂.如果为插入语的话,C可以吗?2.The manager made Tom a better offer _____.a.than wilfred’s B. than that of wiflfred C. than that of wilfred’sD. than he made wilfred答案为D,那为何B错???

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y