,并说明理由 The river used to ______ clean and there were many fishes ,but now it is heavily polluted and there is no fish any more A were B was C being D be

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,并说明理由 The river used to ______ clean and there were many fishes ,but now it is heavily polluted and there is no fish any more A were B was C being D be

,并说明理由 The river used to ______ clean and there were many fishes ,but now it is heavily polluted and there is no fish any more A were B was C being D be
,并说明理由
The river used to ______ clean and there were many fishes ,but now it is heavily polluted and there is no fish any more
A were B was C being D be

,并说明理由 The river used to ______ clean and there were many fishes ,but now it is heavily polluted and there is no fish any more A were B was C being D be
肯定是选 D.be
to的后面用原型呀.