摘要： half an hour ago
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I ________ my food half an hour ago and it ________ yet.
- A.ordered, hasn't arrived
- B.has ordered, didn't arrive
- C.ordered, didn't arrive
- D.has ordered, hasn't arrived
My mother __________ cooking half an hour ago.
[ ]
A. busy
B. kept busy
C. keep busy
D. keeping
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B. kept busy
C. keep busy
D. keeping
It me half an hour to finish my home work 2 hours ago.
A. spends B.took C.takes D .costs .
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