【题目】Mary was pleased to see that the seeds she ______ in the garden were growing.
A. was planting B. has planted C. would plant D. had planted
在线课程【答案】D
【解析】考查过去完成时态。它表达的是在某个过去动作或时间点之前发生的动作，简单地说就是“过去的过去”发生的事情。句意:玛丽很高兴她在花园里种的种子正在生长。根据句意可知，种种子是在种子成长之前，故选D。