The secrecy of the police operation against the gang was complete. It seems only in jail did its bosses discover their phone calls……………listened to for months.

Câu hỏi :

The secrecy of the police operation against the gang was complete. It seems only in jail did its bosses discover their phone calls……………listened to for months.

A were being              

B had been

C were

D have-been

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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