—____ the workers are very tired, _____t
题型：选择题
问题：
—____ the workers are very tired, _____they keep on working.
— They are great. We must learn from them.
A．Because; /
B．Though; /
C．Because; so
D．Though; but
—____ the workers are very tired, _____they keep on working.
— They are great. We must learn from them.
A．Because; /
B．Though; /
C．Because; so
D．Though; but