Question

3. (2014 湖北武汉，40, ★★★) I didn’t know       .

   A. when would the train arrive

   B. where could I get the book

   C. what has been done

   D. who left the message

Answer 1

3. D

由此处主句中的“didn’t”可知从句中要用相关的过去时态，因此排除C项；由于宾语从句中要用陈述句语序，可排除 A、B两项。故选D。