四六级考试

试题来源：大学四级-392
【单选题】 Some students can't attend ground classes because they ______.
A．are too lazy
B．don't have the money to study
C．may not be able to attend classes for military reasons
D．are sick or too busy

参考答案：D
网考网解析：
答案可以从文章第三段第二句得出。 ... 查看试题解析出处>>