16．Why was——青夏教育精英家教网——

16．Why was

15．What did

14．Whose pen have

13．When will

12．How often must

11．What。问数学计算结果也可用 How much，但因此题只有一个空，所以只能填what.

10．Which

9．How much did

8．How have

7．What will

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