题目内容
【题目】The pet dog ________ when I am away on vacation,Nancy.
A. must be looked after well B. must look after well
C. must be looking after well D. must have looked after well
【答案】A
【解析】
句意:——南希,我外出度假时,必须好好照顾这只宠物狗。A. must be looked after well必须被照顾好;B. must look after well必须照顾好;C. must be looking after well 必须被正在照顾好;D. must have looked after well必须已经照顾好。根据主语是The pet dog可知这里用被动语态,其结构是情态动词+be +动词的过去分词;
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