d,b,d,d,c,b,c,b,a,d
d,b,d,a,c,b,c,d,c
倒数第2题选d
6:d、but
7:b、nine-tenth
8:b、a half and an hour
9:d、though
10:c、so
11:d、the act second
12:c、hundreds of
13:b、some hundred
14:a、So does
15:c、seven-year-old
D B D A C B C B A C
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