Question

请帮忙解决，要有过程，谢谢。

We ( ) on it for many hours, but we have not yet reached any conclusion.
A.are being worked B are working C have being working Dhave been worked
( )your best?It is not satisfactory.I'm afraid you will have to do it again
A Do your try BHave you tried C Are you trying D Have you been trying

Answer 1

1.根据意思：我们------很多个小时了，但是我们还没有得到任何结论。此处是表示一个持续状态，即are working，选B。A是被动态，错；C错在being，应该是been；D错在worked，应该是working。
2.选B，这句话的意思是：你尽力了吗？这令人不满意。恐怕你还得再来一次

Answer 2

1D
2B

Answer 3

1，C 我们已经工作了很多小时了，但我们还没有任何结论，have being doing表示从过去到现在一直在做。从后面have not 看出工作一直延续到现在
2，B 你已经做了努力了吗，但并不完善，我恐怕你应该再试一次，have done表示完成从后面will看出前面的尝试已经完成