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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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217次组卷
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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