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1 . Health officials argue that the protection ______ by the COVID vaccine booster shots fades over time, but they didn’t make it clear how urgently people should get second boosters.
| A．ensuring | B．being ensured | C．ensured | D．having ensured |
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2022-05-01更新
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2卷引用：上海市延安中学2021-2022学年高一下学期期中线上教学质量评估英语试题
