You should (check) the air in the (tires) (as) you (start on) a long automobile trip.

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问题 You should (check) the air in the (tires) (as) you (start on) a long automobile trip.

选项 A、check
B、tires
C、as
D、start on

答案C

解析 从属连词误用,应改为before。
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