【題目】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：四歲時她就會騎自行車。be able to=can意為“可以，能”，could的是can的過去式，而have to意為“不得不”，must“必須”，故選C。

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