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        1. These young trees must ______.
          A.look after wellB.be look after wellC.be looked wellD.be looked after well
          D
          look after是照顧照看的意思,小樹是照看的對象,所以要用被動語態(tài)。被動語態(tài)結(jié)構(gòu)為be動詞加動詞的過去分詞,所以D為正確答案。
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