_they are very tired ,they keep on working ----They are great .we must learn from themA Beacause;\B Beacause;soC Though;\D Though;but

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_____they are very tired ,____they keep on working ----They are great .we must learn from them
A Beacause;\
B Beacause;so
C Though;\
D Though;but

C
Beacause;so
Though;but
不能连用

_____they are very tired ,____they keep on working ----They are great .we must learn from themA Beacause;\B Beacause;soC Though;\D Though;but