______ their service, the workers of the hotel are active in learning English.
| A．Improving | B．To improve | C．Improve | D．Having improved |
相关试题
The tomato juice left brown ____ on the front of my jacket．
| A．spots | B．points | C．tracks | D．traces |
Most of the professors _____ to our school were from South Africa．
| A．invited | B．to be invited | C．being invited | D．had been invited |
—Alice, you look puzzled．Haven’t you understood it?
—Yes．I _____of another problem just now．
| A．had thought | B．have thought | C．thought | D．was thinking |
By looking at a problem in as many ways as possible, creative thinkers can find solutions that would _______ remain invisible．
| A．otherwise | B．yet | C．already | D．fo rever |
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