While he was investigating ways t improve the telescope Newton made _______discovery which completely changed ____ man’s understanding of color.
| A．a ,/ | B．a ,the | C．/, the | D．the ,a |
相关试题
At present, one of the apartments in favor of the new airport ________ that it will going a lot jobs to the area. 
| A．is | B．are | C．will be | D．were |
It was _____ he came bank from Africa that wear _________ he met the girl he would like to marry. 
| A．when; then | B．not; until | C．not until; that | D．only; when |
The house I grew up ________ has been taken down and replaced by an office building. 
| A．in it | B．in | C．in that | D．in which |
Some people fear that ________ air pollution may bring about changes in _______ weather around the world.（）
| A． |
/; the |
B． |
the; / |
C． |
an; the |
D． |
the; a |
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