our teacher(works hard)for us.
因为teacher 是单数,而hard work、hard working不能作谓语那teacher是复数 teachers 那应该选哪个？work 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)
英语人气：963 ℃时间：2019-08-18 12:34:33
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