填: is...it
A set of keys is on the table. Let me get it .
类似A set of keys这样的量词短语作主语时, 谓动根据量词的单复数来决定.
此题A set 为单数,故用is,相应地后面就用it 了.
又如: A pair of chopsticks is on the table.
桌子上有一双筷子.
10 pairs of chopsticks are on the table.
桌子上有十双筷子.
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