问题补充:
— Has your mother finished her paper yet?
— I don’t know; she it this morning.
A. wrote
B. has written
C. had written
D. was writing
答案:
A. wrote
B. has written
C. had written
(答案→)D. was writing
解析:考查时态。句意:—你妈妈写完论文了吗?—我不知道,今天早晨她还在写呢!根据句意说明在今天早上这段过去的时间里所发生的事情,所以使用过去进行时。故D正确。