The season is long. He can't revise it in an hour
A, The season is long. Therefore he can't revise it in an hour
B, The season is long. However ,he can't revise it in an hour
C, The season is long. Nevertheless, He can't revise it in an hour
D, Although the season is long. He can't revise it in an hour
/therefore: vì vậy/
~Xin hay nhất ạ~