单项选择题

She ______ on this essay for twenty minutes but she has written only about a hundred words.

A．will be working
B．worked
C．has been working
D．will have worked
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单项选择题
Carey didn't go to the party last night because she ______ the baby for her sister until 9:30.
A．must have looked after
B．would have to look after
C．had to look after
D．should have looked after
单项选择题
Did you mean I should keep the receipt I'm afraid I have ______ .
A．run it over
B．torn it up
C．taken it apart
D．shaken it off
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