问题

My sister is only four years old, but she can look after ________ now.
A:have been to
B:has been to
C:has gone to
D:have gone to;
B:has been to
C:has gone to
D:have gone to;
正确答案是:
同类题型
The traffic signs warn people____ after drinking.
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This is a(n) __________ arrangement,not a permanent one.
With a lot of difficult problems ________, the newly-elected president is having a hard time.
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