Daisy has been learning Putonghua __________ the age of five.

A．a(chǎn)tB．sinceC．forD．in

B

解析試題分析：句意：Daisy在他從他五歲的時(shí)候就學(xué)普通話�，F(xiàn)在完成時(shí)可以用來(lái)表示發(fā)生在過(guò)去某一時(shí)刻的,持續(xù)到現(xiàn)在的動(dòng)作（用行為動(dòng)詞表示）或狀態(tài)（be動(dòng)詞表示）常與for（+時(shí)間段）,since（+時(shí)間點(diǎn)或過(guò)去時(shí)的句子）連用.根據(jù)該句是現(xiàn)在完成時(shí)態(tài)，the age of five 是時(shí)間點(diǎn)，故選B。
考點(diǎn)：考查介詞的用法。

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