That’s all for the introduction to your arrangements these days. So now ______ there are any questions, I’d like to go ahead and start the first video.
| A．if | B．unless | C．until | D．though |
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That’s all for the introduction to your arrangements these days. So now ______ there are any questions, I’d like to go ahead and start the first video.
| A．if | B．unless | C．until | D．though |
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