Mr. Robinson       in China for many years, but now he is in Australia.
#100300
A
has lived
B
had lived
C
lived
D
was living
推荐题目
By the time Billy was 6, he         in the sea.
#101498
A
had already swum
B
was already swimming
C
has already swum
D
already swam
Three fourths of the homework _______ today.
#103523
A
has finished
B
has been finished
C
have finished
D
have been finished