Previously ______ at a fast food restaurant, the Smiths were dissatisfied with the unhealthy meals they served there.
| A．volunteered | B．to volunteer | C．volunteering | D．having volunteering |
相关试题
The scientist’s many years’ careful observation ____ a surprising discovery.
| A．ran into | B．began with | C．led to | D．came from |
Don’t come and see me today – I’d rather you ____ tomorrow.
| A．to come | B．come | C．came | D．coming |
It is clear that your ____ English will greatly improve if you can practice ____ wherever you can.
| A．speaking; speaking | B．speaking; spoken |
| C．spoken; speaking | D．spoken; spoken |
This means going back to the place where we left the family ____ in a tree the night before.
| A．to sleep | B．to be sleeping | C．slept | D．sleeping |
__ to sleep in the trees.相关知识点
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