单项选择题

Have you ever spent a lot of time ______ for a perfect Christmas present

A. search
B. to search
C. searching

D. searched
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单项选择题
When taking a shower, please ______ that the shower curtain is inside the bath.
A. sure
B. ensure
C. insurance

D. ensue
单项选择题
Doily might have been ______ responsible for the traffic accident.
A. partly
B. part
C. apart
D. partial
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