Look!How hard they________(work).最好写一下原因
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Look!Howhardthey________(work).最好写一下原因Look!Howhardthey________(work).最好写一下原因Look!Howhardthey________
Look!How hard they________(work).最好写一下原因
Look!How hard they________(work).
最好写一下原因
Look!How hard they________(work).最好写一下原因
are working
因为前面用look 说明动作正在发生,所以用现在进行时