Fourteen ______ seven is twenty-one.(加)

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Fourteen______sevenistwenty-one.(加)Fourteen______sevenistwenty-one.(加)Fourteen______sevenistwenty-on

Fourteen ______ seven is twenty-one.(加)
Fourteen ______ seven is twenty-one.(加)

Fourteen ______ seven is twenty-one.(加)
plus or and

plus
或者 and , add 都可以