Authorities should warn  people against  ____________ hazardous foods containing additive. Still better, perhaps, they  shouldn’t allow such products ________ in the first place.

Câu hỏi :

Authorities should warn  people against  ____________ hazardous foods containing additive. Still better, perhaps, they  shouldn’t allow such products ________ in the first place.

A to be using – produced                                       

B having used – to produce

C using – to be produced                                       

D being used – being produced

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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