The young man stopped and looked back as if ______ whether he was being followed.
#95381
A
seeing
B
to have seen
C
having seen
D
to see
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 As the immune system weakens, it loses the ability ________ illnesses.
#88514
A
fighting
B
fought
C
to fight
D
to be fought
--- If John does not come to work on time, he may be fired.---Surely he is not so foolish _________ that.
#96985
A
as not to realize
B
as not realizing
C
that doesn’t realize
D
as to realize
---- What was it that made Susan weep? ---- ________of cheating in the exam.
#92216
A
Being charged
B
That she was accusing
C
Because she was charged
D
Being accused