(单选题)
The students are studying hard, for they know ______.
A.what are they studying for
B.what are they studying
C.what they are studying for
D.why they are studying for
参考答案:C
参考解析:
考查宾语从句的语序。句意:学生们在努力学习,因为他们知道他们在为谁学习。宾语从句应使用陈述语气,排除A项和B项,D项for后面缺少介词宾语,why只能充当状语,应使用what。故选C。
知识点:
