-- I called you this morning, but nobody answered it.
-- Oh, we ______ some shopping at the supermarket.
| A．are doing | B．were doing |
| C．have done | D．did |
-- I called you this morning, but nobody answered it.
-- Oh, we ______ some shopping at the supermarket.
| A．are doing | B．were doing |
| C．have done | D．did |
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