单选题 According to recent research, night shift workers tend to make three times as many errors ______ their colleagues on the day shift.

【正确答案】 D

【答案解析】[解析] 语法：同级比较级
1．本题考查同级比较级，前文出现as many，与其相搭配的为连词as，因此D为正确选项。
2．比较级形式as many (much) as和more...than常在考题中出现。