our teacher( )for us(填哪个hard work、hard working、work hard、words hard)

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our teacher( )for us(填哪个hard work、hard working、work hard、words hard)
our teacher( )for us(填哪个hard work、hard working、work hard、words hard)

our teacher( )for us(填哪个hard work、hard working、work hard、words hard)
our teacher(works hard )for us.
因为teacher 是单数,而hard work、hard working不能作谓语

应该是works hard

works hard