It's( )not his mother( )came across me last weekA him,whom B he,who C him,who D he,whom

It's( )not his mother( )came across me last weekA him,whom B he,who C him,who D he,whom
It's( )not his mother( )came across me last week
A him,whom B he,who C him,who D he,whom

It's( )not his mother( )came across me last weekA him,whom B he,who C him,who D he,whom
B
这句话的意思是：是他不是他妈妈上星期遇见我.
他遇见我这个结构,他是主语,作主语的话要用主格,主格是he,（him是宾格,宾格做宾语）.
who和whom也是,who是主格,作主语,whom是宾格,做宾语,come across后面的me是宾语,而它前面缺少主语,所以用who

C

c，第一空应该用he的宾格。第二空定语从句用who作his mother 的宾语，

B

B
是（1.他）不是他妈妈（2.她）遇见我上星期。
1他是句子的实际主语.，是it 代替的主语，用he
2.她是Came across的主语，用疑问词who
四楼说得很详细也很对了。

b

B

明显选C嘛