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【单选题】
(A) Since Maria needed vaccines to travel, she made an appointment with the doctor. (B) _________ vaccines to travel, Maria made an appointment with the doctor.
A.
Needed
B.
Needing
C.
Since she needed
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参考解析：
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举一反三
【单选题】(A) Because we wanted to find jobs, we moved to a bigger city. (B) _________ to find jobs, we moved to a bigger city.
A.
Wanting
B.
Having wanting
C.
Wanted
【单选题】(A) Because it sold more than expected, the drug company ran out of medicine. (B) _________ more than expected, the drug company ran out of medicine.
A.
Selling
B.
Sold
C.
Because selling
【单选题】He keeps them in _____.
A.
plastic bags inside plastic boxes
B.
their original packages