The thought of going back home was ----------kept him happy while he was working abroadA thatB all thatC all what D which 为什么不选A呢 不是定语从句吗

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The thought of going back home was ----------kept him happy while he was working abroad
A that
B all that
C all what
D which 为什么不选A呢 不是定语从句吗

B
表语部分意为“所.的”,所以要么是what kept him happy ,要么是all that kept him happy
因为what= all that,可见A 不对

没个先行词,怎么能是定从呢,是表从