问题
选择题
Just after putting the baby onto bed, Mrs. White suddenly caught sight of the pet cat and didn’t know how long it________ on the table for the family dinner.
A．had been laying; lying
B．had been lying; laid
C．had been laid; laid
D．had lain; laying
答案
B。
had been lying为过去完成进行时，表示一个动作或状态从过去开始一直持续到过去的某个时间，该句表示状态，而had been laid强调动作，laid为lay的过去分词，修饰限制the table。