1 if, sold
2 if, has
3 when, would
4 had won
5 if, could
6 whether to
7 if, brought
8 what to
9 when to
10 where to
11 if, would
12 told, travels
13 if, enjoys
14 if, had
15 没有这题?
16 what, would
17 whether to
18 was invented
19 we should
20 asked, to go
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