_____ how mirrors produce image, we need to know what light does. [ ]A. U
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_____ how mirrors produce image, we need to know what light does. |
[ ] |
A. Understanding B. Understood C. To understand D. Having understood |
答案
C |
举一反三
Last Monday, I was asked to give the new students a test ______ their English level. |
[ ] |
A. grading B. to have graded C. to grade D. having graded |
My families consider ____ a computer, which is considered _____ a great help in our work and study. |
[ ] |
A. to buy ; to be B. buying ; being C. to buy ; being D. buying ; to be |
They set out _______ for the _______boy. |
[ ] |
A. searching, losing B. searching, lost C. to search, lost D. searching, losing |
With a lot of difficult problems_____,the newly-elected manager is having a hard time. |
[ ] |
A. settled B. settling C. to settle D. being settled |
Having mastered the technology of manned spacecraft, China became the third country in the world ______ manned spaceflight independently. |
[ ] |
A. to develop B. developing C. developed D. develop |
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