I wrote to my parents once a week,____ I was too busy with my teaching work.
#80142
A
it
B
unless
C
when
D
as
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The man, ____ is parked in front of our school, is a well-known politician.  
#34099
A
whose white car      
B
of whom the white car  
C
of whose white car
D
the red car of his
______ I went to Mount Hua, I was deeply impressed with its beautiful scenery.
#30935
A
For the first time
B
The first time
C
At first
D
It was the first time