—I telephoned him twice and I couldn’t get through to him．
—The line might have been out of order, _________?
| A．don’t you | B．do you |
| C．wasn’t it | D．hadn’t it |
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—I telephoned him twice and I couldn’t get through to him．
—The line might have been out of order, _________?
| A．don’t you | B．do you |
| C．wasn’t it | D．hadn’t it |
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