“What courses are you going to take next semester if you want to receive enough credits to get your degree?”“I don’t know．But it’s about time ________ on something．”A.I’ d decideB.I decidedC.I decideD.I’m deciding
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B解析It’s(about)time(that)…是虚拟语气句式，其谓语动词要用一般过去式，因此B项是正确