问题补充:
单选题Itis_______heoftenfailsinexam_______makeshisparentsworriedabouthim.A.because, thatB.that, thatC.不填, thatD.what, that
答案:
B解析考查主语从句和强调句型。整个句子是强调句型,所以第二空用that引导;去掉it is…that,剩下_______ he often fails in exam makes his parents worried about him.可知_______ he often fails in exam是主语从句,且从句不缺成分,所以用that引导。选B。