— 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

The students in our school each_________ an English dictionary.

#86116

have

has

had

arehaving

 Playing football and watching TV _____ both interesting.

#86210

were

was

are

________ his brothers.

#44004

This is

That’s

These are

That’s isn’t

Mr. Bush,  together with his wife and daughter _____ going to Japan next week.

#86309

are

will be

would be

---What   _____ your father? --- He’s a cook.

#44194

are

does

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