____she couldn't understant was___fewer and fewer students showed interested in her lessons填what why还是 why what打错了 是understand
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____shecouldn''tunderstantwas___fewerandfewerstudentsshowedinterestedinherlessons填whatwhy还是whywhat打错了
____she couldn't understant was___fewer and fewer students showed interested in her lessons填what why还是 why what打错了 是understand
____she couldn't understant was___fewer and fewer students showed interested in her lessons
填what why还是 why what
打错了 是understand
____she couldn't understant was___fewer and fewer students showed interested in her lessons填what why还是 why what打错了 是understand
what why
understand是及物动词,只能接what；后面句子是个完整的句子,陈述事实,只能用why