were covered 作谓语表示被动 意为 被覆盖 而 covered是were covered的形容词 可做非谓语动词
不一定都要用过去式 你得具体情况具体分析 比如句子中的直接引语 和 一些自然常识都应用一般现在式 学英语不应死板
I must confess that I was under the impression that W.P.A.in
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