单选题
The kidney transplant operation was ______ complicated, so the operating team had to take special care to ensure its success.
A、
slightly
B、
nearly
C、
extremely
D、
probably
【正确答案】
C
【答案解析】
[考点] 词义辨析
[解析] slightly：轻微地；nearly：几乎不；extremely：极端地，非常；probably：大概，或许，根据句意选C。
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