While Helen ________ the piano，her mother came in．
#39922
A
was playing
B
is playing
C
played
D
plays
推荐题目
The girl with her grandparents for the moment because her parents are both very busy this month.
#42119
A
lived
B
is living
C
live
D
was living
Mary with her sisters ________ Chinese in China.
#42691
A
are studying
B
have studied
C
is studying
D
study
Mr. Black is going to marry a girl he __________ in Japan last year.
#42139
A
meets
B
met
C
has met
D
would meet