先把这个句子还原成陈述句 this problem is ___ the teacher explained last week.很明显,is后面缺一个表语,而这个表语在后面的从句中充当宾语.可以直接用 what ,l来引导这个表语从句which或者是that是不可能引导表语从句的.这个题也可以转换为一个定语从句the one,充当is 的表语,再用that 做引导词,引导定语从句,因为做从句的宾语,所以that 省略了
Is this problem ___ the teacher explained last week?A whichB
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