the reason for his failure is that he lacked capital at that time
A is B
A是B 两个就是一个东西
不能用because(because 表原因)
what 要在从句中作句子成分,但是从句不缺成分,不能用what
the reason for his failure is that he lacked capital at that time
A is B
A是B 两个就是一个东西
不能用because(because 表原因)
what 要在从句中作句子成分,但是从句不缺成分,不能用what