The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.
| A．to be invented | B．having been invented |
| C．invented | D．to have been invented |
相关试题
We need to ____ our active vocabulary step by step.
| A．grow | B．add | C．develop | D．raise |
The young woman walking on the street looked nice, so Vince ___ her a lift.
| A．shared | B．took | C．gave | D．put |
My son John asked me to ___ him off at school on my way to work because it was raining.
| A．take | B．drop | C．put | D．cut |
—I am sorry to have __ too much of your time. —That's OK, and I am glad to help you.
| A．taken up | B．taken on | C．taken off | D．taken in |
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