Many people nowadays have muscular problems in the neck, the shoulders and the back

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问题 Many people nowadays have muscular problems in the neck, the shoulders and the back

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答案mainly due to/because of stress and tension in their work

解析 本题考查原因状语。分析句子可以发现句子主干完整,故填入部分应该为非谓语,用 due to或because of。
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