By the time some scientists ____ the lost towns, they ___

By the time some scientists ____ the lost towns, they ____ an awesome historical site.

#101150

had found, had found

found, found

found, had found

had found, found

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 The fans ______ to see the pop singer the whole afternoon, and they won’t leave until he turns up.

#99793

have been waiting

waited

had waited

would have waited

Social attention should be paid          our earth from        .

#102039

to prevent; being polluted

to preventing; polluted　

to prevent; polluting

to preventing; being polluted

My watch _____ at nine o’clock, but now it _____.

#101326

was going; stopped

went; is stopping

was going; has stopped

went; stopped

I am disappointed because I ______________my favourite writer yet.

#99547

didn’t see

haven’t seen

don’t see

have not been seeing

-Why does the Lake smell terrible?-Because large quantities of water__________.

#104945

have polluted

is being polluted

has been polluted

have been polluted

共5993题