问题
选择题
--- I haven’t seen Mary recently. And you?
--- Me neither. I’m afraid she _________ to her experiment for too long a time.
A．is devoting
B．was devoted
C．has been devoting
D．has been devoted
答案
答案：D
考查时态。固定词组be devoted to致力于。根据上下文可知我最近没有空间Mary,是因为她致力于做实验。使用完成时表示过去发生的事情对现在的影响。
，m=0
，m=
，m=0
，m=