A.neverB.alsoC.onceD.seldom
A. never
B. also
C. once
D. seldom
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A.had toB.shouldC.mightD.must
A. had to
B. should
C. might
D. must
A.cognizantB.recognizableC.rememberableD.identical
A. cognizant
B. recognizable
C. rememberable
D. identical
A.neverB.neitherC.andD.or
A. never
B. neither
C. and
D. or
A.found outB.identifiedC.discoveredD.known
A. found out
B. identified
C. discovered
D. known