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【题目】She was able to ride a bike when she was four.
A.had to
B.must
C.could

【答案】C
【解析】句意:四岁时她就会骑自行车。be able to=can意为“可以,能”,could的是can的过去式,而have to意为“不得不”,must“必须”,故选C。

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