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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