【C18】A．basisB．baseC．basedD．basing

There was no _____ for this belief.A、basicB、baseC、basisD、bases

【C18】A．onB．beforeC．atD．in

【C18】A．merelyB．alwaysC．mainlyD．almost

【C18】A．thatB．whichC．whatD．／

The opera is _____ on a true story.A: basisB: basicC: basingD: based

Marriage（) on true love often brings happiness.A.decidedB.determinedC.basedD.relied