Not that I'm unwilling to go with you, ________I'm busy now.
A. because B. but C. but that D. however
Not that I'm unwilling to go with you, ________I'm busy now.
A. because B. but C. but that D. however
C
（It is）not that……but that相当于（It is）not because…but because…意为“不是因为……而是因为……”。