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(dòng)語(yǔ)態(tài)。被動(dòng)語(yǔ)態(tài)的構(gòu)成是am/is/are+過去分詞。These young trees是物作主語(yǔ)，應(yīng)該用被動(dòng)語(yǔ)態(tài)；must后應(yīng)該用動(dòng)詞原形，am/is/are的原形是be，排除A、C；D項(xiàng)的固定短語(yǔ)缺少介詞of，排除D�！罢疹櫋眑ook after=" take" care of。故選B。
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