Zhangqiang is said ______ the experiment in the lab, but I can’t find him there. 
#92292
A
to have done
B
to do
C
to be doing
D
doing
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Not until I had arrived home______ my appointment with Michael Smith.
#93101
A
did I remember
B
that I remember
C
when I remember
D
had I remember
It is required that in no case ________ our password.
#93878
A
we should forget
B
should we forget
C
shall we forget
D
we shall forget
He moved away from his parents and missed them ________enjoy the exciting life in China. 
#94969
A
too much to
B
very much to
C
enough to
D
much so as to