We won"t know how the plan works till we have tried it ________.
答案 :
out
They__________on the program for almost one week before I joined them, and now we ________on it as no good results have come out so far.
| A．had been working; are still working | B．had worked; were still working |
| C．have been working; have worked | D．have worked; are still working |
答案 :
A
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