I      my homework, I guess I can't join you.
A．don't finishB．didn't finishC．haven't finishedD．won't finish
A
考查現(xiàn)在完成時。句意為“我猜想我不能加入你們，因為到現(xiàn)在我還沒有完成作業(yè)”，從過去時間一直持續(xù)到現(xiàn)在，用現(xiàn)在完成時態(tài)表示。故選C。
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