——Do you have any idea when the project will be carried out?
—No, but I have heard that it was not until last month _______ it was approved.
| A．that | B．when | C．since | D．before |
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——Do you have any idea when the project will be carried out?
—No, but I have heard that it was not until last month _______ it was approved.
| A．that | B．when | C．since | D．before |
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