摘要： doing, were, what, you, arrived, UFO, the, when
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—What were you doing when the UFO arrived?— I with my dog on the street.
A. walked B. was walking C. is walking D. have walked
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---What were you doing when the UFO ______?
---I ______ a milk shake.
A. reached, made B. reached, was making C. arrived, made D. arrived, was making
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---What were you doing when the UFO ______?
---I ______ a milk shake.
---I ______ a milk shake.
| A．reached, made | B．reached, was making | C．arrived, made | D．arrived, was making |