. --So hard __________ in the past few months that he has made great progress in English. --I can see that, only a few mistakes he made in this exam.
#103811
A
he worked
B
did he work
C
he has worked
D
has he worked
推荐题目
---Mom, can we move into our new house this weekend? ---No, it _________.
#102404
A
is painted
B
is painting
C
was painted
D
is being painted
--Why does the lake smell terrible? -- Because a large amount of water_______.
#99621
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
A new cinema          here. They hope to finish it next month. 
#101255
A
will be building
B
is built
C
has been built
D
is being built