问题

If I wasn’t busy., I could have been back by 5:30 o’clock—– What a pity! She____ here to see you

A:is
B:was
C:had been
D:has been

正确答案是：

同类题型

The waste water, when _______，should be clean enough to meet standards.

toask questions at the end of the lecture

You kept me _______so long.

Paper making began in China and from there it _____ to North Africa and Europe.

lice still haven’t found her, butthey’re doing all they _____