Today, most of the difficult and dangerous work is done by computers and other powerful machines. In the past conditions of (3) were not as comfortable as they are now.

Câu hỏi :

Today, most of the difficult and dangerous work is done by computers and other powerful machines. In the past conditions of (3) ______ were not as comfortable as they are now.


A. live                                        

B. livable  

C. lively      

D. living 

* Đáp án

* Hướng dẫn giải

Đáp án đúng là: D

Sau giới từ cần Ving.

Dịch: Trong quá khứ điều kiện sống không được thoải mái như bây giờ.

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