I have been living in the United States for 20 years, but seldom ______ so lonely as now.
#81842
A
have I felt
B
I had felt
C
I have felt
D
had I felt
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Not until he met with the difficulty _______ the importance of group work.
#82975
A
he realized
B
did he realize
C
realized he
D
he didn’t realize
 _______, she is quite modest.
#80435
A
As she is an experienced teacher
B
An experienced teacher as she is
C
Experienced teacher as she is
D
Experienced teacher although she is
Only then _________the importance of my health.
#82987
A
did I realize
B
had I realized
C
I realized
D
I had realized