Paul had to write a history paper, _____
题型:选择题
问题:
Paul had to write a history paper, ______ he couldn't find time to do it. [ ]
A. but
B. so
C. became
D. if
Paul had to write a history paper, ______ he couldn't find time to do it. [ ]
A. but
B. so
C. became
D. if