He's been collecting stamps _             he was eight years old.
A．whenB．whileC．a(chǎn)ndD．since
D

試題分析：句意：自從他八歲時(shí)，他已經(jīng)開始收集郵票。分析主句是現(xiàn)在完成時(shí)，從句是時(shí)間，因此只有since符合題意。故選 D
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