It's necessary for us ________ them every day.

[  ]

A.

walking

B.

to walk

C.

walks

D.

to walking

答案:B
解析:

It's necessary for sb.to do sth.意為“對某人來說干某事很有必要”。此處walk意為“溜”“牽著動物散步”,them指貓、狗等一些寵物。


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