30.The problem of global warming ______ for decades. A: has been existed B: has existing C: being existed D: has existed
30.The problem of global warming ______ for decades. A: has been existed B: has existing C: being existed D: has existed
Some research workers completely all those facts as if they never existed.
Some research workers completely all those facts as if they never existed.
During the early years of hardwired NC, built-in diagnostic tools existed.
During the early years of hardwired NC, built-in diagnostic tools existed.
Confucian had existed before Confucius.
Confucian had existed before Confucius.
Slavery still existed in the United States nowadays?
Slavery still existed in the United States nowadays?
As a phenomenon, intercultural communication has existed for thousands of years.
As a phenomenon, intercultural communication has existed for thousands of years.
在下面程序运行结果为（）。 A: SCORE existed! GREED is not defined! B: No SCORE! GREED is not defined! C: SCORE existed! GREED is defined! D: No SCORE! GREED is defined!
在下面程序运行结果为（）。 A: SCORE existed! GREED is not defined! B: No SCORE! GREED is not defined! C: SCORE existed! GREED is defined! D: No SCORE! GREED is defined!
Several literary trends existed side by side in the Victorian Age.
Several literary trends existed side by side in the Victorian Age.
There _____ to be nobody in the office. A: happened B: has C: existed D: is
There _____ to be nobody in the office. A: happened B: has C: existed D: is
Some national political institutions existed in America before the War of Independence.
Some national political institutions existed in America before the War of Independence.