— Why does the boy keep crying?
— It is ______ he has lost his favorite car model.
A．since B．so C．whenD．because
D

試題分析：考查連詞：A. since自從，B. so所以，C. when當,…時候，D. because因為，句意：為什么這些男孩一直在哭？--是因為他失去了最喜歡的汽車模型。Because引導(dǎo)表語從句，回答why的問題。選D。
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