No matter how hard he worked, ______.
A、
he could not do any better
B、
and he could not do any better
C、
so he could not do any better
D、
but he could not do any better
【正确答案】
A
【答案解析】
本题考查让步状语从句。No matter how hard he worked是让步状语从句，与其后的主句之间不需要连接词。
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