24．Excuse me, Madame. You still haven’t answered my question yet. Was it at 8 o’clock
you heard Mr. Croft_______at the door?
| A．when; knocking | B．when; knock | C．that; knocking | D．that; knock |
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24．Excuse me, Madame. You still haven’t answered my question yet. Was it at 8 o’clock
you heard Mr. Croft_______at the door?
| A．when; knocking | B．when; knock | C．that; knocking | D．that; knock |
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