Although observing and recording their daily activities ____ very tiring and dirty sometime.
横线处应该填is还是are呢?
两个动名词并列和两个动名词共有一个宾语,是不同的。前者谓语动词使用复数,后者谓语动词使用单数。试比较:
Reading and writing are two basic skills in English learning.
阅读和写作是英语学习的两项基本技能。
Observing and recording their daily activities is very tiring and dirty.
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