Customers (are asked) to ensure that they (have given) correct change before (leaving) the shop as mistakes cannot be (afterward

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问题 Customers (are asked) to ensure that they (have given) correct change before (leaving) the shop as mistakes cannot be (afterwards) remedied.

选项 A、are asked
B、have given
C、leaving
D、afterwards

答案B

解析 被动式,需要将have given 改成have been given。
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