答：第一题选C.
run一般都用fast修饰.
fast是形容词,放在enough前.
第二题选B
half an hour半个小时,单数
这里需表示半个小时的骑车路程.
第三题选A
be doing时态表进行时,C,D就排除了
前半句进行时,后半句不是进行时,故不能选B
The boy didn't run___to catch the thief
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