①关于to do 还是doing:不带to的动词不定式作宾语补足语的主动语态改为被动语态时,省略的to要加上。
常考的动词有make, let, have, see, watch, notice, hear等。
例如:
1. They heard the children sing that morning.
→ The children were heard to sing that morning.
2. The teacher made the little boy stand in the classroom.
→ The little was made to stand in the classroom by the teacher.
②关于时态:他过去的愚蠢行为导致他现在失去工作,过去的行为影响到现在或在如今留下某种结果,用现在完成时
think后不接动名词,所以C,D不对。A表将来所以也不对。