Are you your son has difficulty in studying at school?
A. aware of
B. aware that
C. knowing that
D. aware of that
网友回答
A. aware of
(答案→)B. aware that
C. knowing that
D. aware of that
解析：考查aware的用法：be aware of sth，be aware that从句，句意：你意识到你儿子在学校学习有困难吗？选B。