— Why does the lake smell terrible?— Because large quantities of water ___

— Why does the lake smell terrible?— Because large quantities of water ____.

#85686

have polluted

is being polluted

has been polluted

have been polluted

推荐题目

Don’t sit on the chair. There ________ on it.

#43991

is some water

are some water

is any water

are any water

The government’s efforts to cut the homework burden of primary and middle school students _____ mixed reactions(反应).

#86275

have drawn

has drawn

have been drawn

has been drawn

There _______ a mother ,a father and three  children in the family.

#44144

have

are

— Here      some photos of you.    —Thanks.

#43760

are

 How ________ time do you spend on your hobby?

#43456

long

often

many

much

共1265题