问题
选择题
— Why does the boy keep crying?
— It is ______ he has lost his favorite car model.
A．since
B．so
C．when
D．because
答案
答案：D
题目分析：考查连词：A. since自从，B. so所以，C. when当,…时候，D. because因为，句意：为什么这些男孩一直在哭？--是因为他失去了最喜欢的汽车模型。Because引导表语从句，回答why的问题。选D。