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These young trees must        .
A．look after wellB．be well looked after
C．take good care ofD．be taken good care
B
考查被動語態。被動語態的構成是am/is/are+過去分詞。These young trees是物作主語，應該用被動語態；must后應該用動詞原形，am/is/are的原形是be，排除A、C；D項的固定短語缺少介詞of，排除D。“照顧”look after=" take" care of。故選B。
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