Just after putting away the dishes, _______.
#93684
A
the doorbell was rung
B
mother heard the doorbell ring
C
someone knocked at the door
D
the doorbell rang loud
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In my opinion, Jack, though relatively stubborn, was not too difficult ___.
#92677
A
to work with
B
working with
C
to be worked with
D
worked with
Not having worked out the program, ________ leave the office. 
#93247
A
so he was forbidden to
B
and he didn’t want to
C
his little son couldn’t make him
D
be couldn’t free himself to
How long ______ we take part in the college entrance examination?
#92168
A
is it since
B
will it be before
C
is it when
D
will it be since