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

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

admin2005-07-06  106
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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