—Mike, what were your parents doing at 8:00 last night?
—My mother was reading________ my father was playing computer games.
| A．while | B．when |
| C．unless | D．as long as |
—Mike, what were your parents doing at 8:00 last night?
—My mother was reading________ my father was playing computer games.
| A．while | B．when |
| C．unless | D．as long as |
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