单选题
He never hesitates to make such criticisms ______ are considered helpful to others.
A、
that
B、
what
C、
which
D、
as
【正确答案】
D
【答案解析】
[解析] such…as相搭配，such意为“这样的”，as为关系代词，代替criticisms，as做从句的主语。
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