is,are,has,have,havingTheaverageBritishfamily,which________smallerandricherthan50yearsago,________3.6members.
is、has
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JeanWagner’mostsenduringcontributiontothestudyofAfro-Americanpoetryishisinsistencethatit________inareligious,aswellasworldly,frameofreference.