--Why did Miss Wang look so worried when we saw her?--Because she wondered______.A.where did the other students goB.when would the policeman eC.what her students have done during the tripD.if her students had survived the earthquake
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D解析考查宾语从句。宾语从句的考查点有两个：①从句部分用陈述语序；②主句是过去时，从句用相应的过去时态。根据第一点我们排除了本题的A、B项。再根据第二点我们又排除了C项，故选D。