【題目】The boy was sitting under an apple tree _______ an apple fell onto his head.
A.when
B.while
C.after
D.before

【答案】A
【解析】引導(dǎo)表示短暫性動(dòng)作的時(shí)間狀語(yǔ)從句應(yīng)用when; while表示動(dòng)作或狀態(tài)的延續(xù)；after和before意思不符合題意。故選A。

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