MOST OF THE FORESTS ………BRITAIN HAVE NOW BEEN DESTROYED.A. THAT ONCE...

20. - DKI LAN II HKI TIENG ANH 12
DKI LAN II HKI TIENG ANH 12

20.Most of the forests ………Britain have now been destroyed.

A. that once covered B. once covered

C. which they once covered D. once they covered