10.he has a headache because he _too long.A has been reading B had read C is reading D read

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10.hehasaheadachebecausehe_toolong.AhasbeenreadingBhadreadCisreadingDread10.hehasaheadachebecausehe_

10.he has a headache because he _too long.A has been reading B had read C is reading D read
10.he has a headache because he _too long.A has been reading B had read C is reading D read

10.he has a headache because he _too long.A has been reading B had read C is reading D read
选A..现在完成进行时,表动作从过去开始持续到现在,并还将继续下去.