-Sorry,I didn't catch your words.-I asked

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根据ABCD的答案选项和前面的语境来看：
A应该改为if the party would start at 7:00比较合适
B应该改为when the train would leave比较合适
C应该是正确的答案
D应该改为why did you do that比较合适
所以本题应该选 C 个人意见.
======以下答案可供参考======
供参考答案1:
A供参考答案2:
排除法 D供参考答案3:
　　C.how much the toys cost