—Wow, you have a really good voice. I_____ you were good at singing.
—Thank you.
| A．haven't known | B．hadn't known |
| C．didn't know | D．don't know |
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—Wow, you have a really good voice. I_____ you were good at singing.
—Thank you.
| A．haven't known | B．hadn't known |
| C．didn't know | D．don't know |
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