WHAT DOES “THEY” IN THE SECOND SENTENCE OF THE LAST PARAGRAPH REFE...

36. - TUYEN TAP DE THI ANH VAN 11 CO DAP AN HOC KY II 45 PHUT LOP
TUYEN TAP DE THI ANH VAN 11 CO DAP AN HOC KY II 45 PHUT LOP
36. What does “they” in the second sentence of the last paragraph refer to? A. Gas power stations B. Coal power stations C. Nuclear power stations D. Hydroelectric power stations WORD FORM: