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( )1000 English words since we ( ) to this school.A.learn,co

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( )1000 English words since we ( ) to this school.A.learn,come B.have learning...
( )1000 English words since we ( ) to this school.
A.learn,come
B.have learning,came
C.have been learning,come
D.have learned,came
为什么不是C?
( )1000 English words since we ( ) to this school.A.learn,co
第一,没听过有have been doing 这个用法,难道是完成进行时?
第二,我们自己学不用被动语态
第三,since 引导的状语从句,since后面永远是过去时.
明白?