David’s effort was ______, because he won the first prize in the English speech contest, which made his classmates surprised.
| A．paid off | B．paid back | C．paid for | D．paid up |
相关试题
The scientist ___ his research for a lack of fund.
| A．deserted | B．c anceled |
C．abandoned | D．quilted |
Charles Babbage is generally considered ___ the first computer.
| A．having invented | B． inventing | C．to have invented | D．to invent |
I send you 100 dollars today, the rest ___ in a year.
| A．follows | B．followed | C．to follow | D．being followed |
An army spokesman stressed that all the soldiers had been ordered ____ clear warnings before firing any shots.
| A．to issue | B．being issued | C．to have issued | D．to be issued |
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