题干
–It's hard work to achieve a balance between schoolwork and hobbies. –So it is, but we have to.
A：a
B：an
C：the
D：不填
答案(点此获取答案解析）
D
–It's hard work to achieve a balance between schoolwork and hobbies. –So it is, but we have to.
A：a
B：an
C：the
D：不填
