题目内容

Daisy has been learning Putonghua __________ the age of five.
A．atB．sinceC．forD．in
B

试题分析：句意：Daisy在他从他五岁的时候就学普通话。现在完成时可以用来表示发生在过去某一时刻的,持续到现在的动作（用行为动词表示）或状态（be动词表示）常与for（+时间段）,since（+时间点或过去时的句子）连用.根据该句是现在完成时态，the age of five 是时间点，故选B。
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