A-A+
(That) troubles me is (that) I can't learn (al
问题详情
(That) troubles me is (that) I can"t learn (all these) English idioms (by heart).
A. That
B. that
C. all these
D. by heart请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：A
that引导主语从句时，不在从句中充当成分。而本句中需要在主语从句中充当主语的关联词来引导这个主语从句，因此that错。可以改为what。
