He walked down the hills, and ________ softly to himself.
#100068
A
sing
B
singing
C
sings
D
was singing
推荐题目
The hospital _________ well, where many wounded ________every day.
#102221
A
is operated; operation
B
operates; are operated on
C
operates; are operated
D
operates; operates on
When I called you this morning, nobody answered the phone. Where ________? 
#104733
A
did you go
B
have you gone
C
were you
D
had you been