It ' s ----,we have to work hard .( ) A a hard work B ,an easy work C.hard work

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It ' s ----,we have to work hard .( ) A a hard work B ,an easy work C.hard work

It ' s ----,we have to work hard .( ) A a hard work B ,an easy work C.hard work
It ' s ----,we have to work hard .( ) A a hard work B ,an easy work C.hard work

It ' s ----,we have to work hard .( ) A a hard work B ,an easy work C.hard work
C work是不可数名词,其前面不应该有冠词,因此,A.B都是错误的.