优优班--学霸训练营 > 知识点挑题
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            • 1. 通过多年的实践,他逐渐掌握了这种研究方法。

              He ________ got ______  _______  of this ________  of research after

              many years’ practice.

            • 2.

              Although Tim and Mike come from               (完全)different backgrounds,they became close friends.

            • 3.

              This   animals is  cute.

              A.kind of, kind of
              B.a kind of, a kind of
              C.kinds of ,kind of
              D.kind of, a kind of
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