A. to stay
B. stayed
C. stay
D. having stayed
A. knowing
B. known
C. to be known
D. having known
A. If being
B. It is
C. There is
D. There being
A. to be based on
B. to base on
C. which to base on
D. on which to base
A. would leave
B. will have left
C. has left
D. had left
A. those B. that
C. what D. where
A. neither B. so
C. either D. both
A. as results
B. which results
C. the results of it
D. the results of which
A. Lacking B. Being lack
C. Because of lack D. Lack
A. Lacking B. Being lack
C. Because of lack D. Lack
A. is the matter
B. is happened
C. is the wrong
D. the trouble is
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