Tom was about to close the window his attention was caught by a bird.
#92304
A
when
B
if
C
and
D
till
推荐题目
______ Marx's works with Engels', and you'll find many differences.
#92685
A
Comparing
B
Compare
C
To compare
D
If you compare
____________, I wouldn’t have finished my homework.
#93949
A
If you didn’t help me
B
Had you not helped me
C
If you haven’t helped me
D
Haven’t you helped me
