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But to mark the tests, they have to use an answer key sent down from the States.
不过为了给测试判分，他们使用的是从美国发来的答案。
youdao
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It takes a lot of time to prepare, administer and mark the tests.
出题，监考和阅卷要花很多时间。
youdao
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It takes a lot of time to prepare, administer and mark the tests.
出题，监考和阅卷要花很多时间。
youdao