图纸格式分为____和____种。

A. To ask for a leave.
B. To ask for help on how to improve writing.
C. To show his outline to the professor.
D. To talk about college life.

A. He has recited enough words and expressions, but he doesn't know how to get started.
B. He has read a lot, but he doesn't know how to recite the new words and expressions.
C. He doesn't know what to write and how to write.
D. He can not understand what the professor taught him.