I had been working on math for the whole afternoon and the numbers        before my eyes.
#102156
A
swim
B
swum
C
swam
D
had swum
推荐题目
——Will you come to my office when you      your work?  ——Sure. 
#103289
A
finished
B
are finishing
C
have finished
D
will finish
– Your job ________ open for your return.– Thanks.
#104588
A
will be kept
B
will keep
C
had kept
D
had been kept