单选题
Rarely
we have seen
such an effective actor
as he
has proven himself
to be
.
A. Rarely
B. we have seen
C. as he
D. to be
A
B
C
D
【正确答案】
B
【答案解析】
改为have we seen。rarely等否定副词放于句首时，后面要用部分倒装语序，即主谓倒装。
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