题文
Though having discussed it for long, they still haven't reached an agreement ______ they should pour more money into the project.
| A．that | B．if |
| C．whether | D．what |
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Though having discussed it for long, they still haven't reached an agreement ______ they should pour more money into the project.
| A．that | B．if |
| C．whether | D．what |
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