Althoughmeasureshavebeenintroducedtodiscouragetheuseofmobiletelephoneinsidetheoperahouse,___effectivenessremainslimited.
A.they B.their C.them D.theirs正确答案B
Althoughmeasureshavebeenintroducedtodiscouragetheuseofmobiletelephoneinsidetheoperahouse,___effectivenessremainslimited.
A.they B.their C.them D.theirs正确答案B