Though I was tired out that evening, I _
题型:选择题
问题:
Though I was tired out that evening, I _____ from falling asleep by the great pain in my knee.
A.was prevented
B.had prevented
C.has prevented
D.am prevented
Though I was tired out that evening, I _____ from falling asleep by the great pain in my knee.
A.was prevented
B.had prevented
C.has prevented
D.am prevented