Coronary angiography, a sophisticated method for diagnosing coronary disease involving the introduction of a dye into the arteries of the heart , is now administered selectively , because it uses x-rays to observe cardiac function.
A for diagnosing coronary disease involving the introduction of a dye into the arteries of the heart , is now administered selectively , because it uses .
B for diagnosing coronary disease involving the introduction of a dye into the arteries of the heart , is now administered selectively , because of using
C for diagnosing coronary disease, involves the introduction of dye into the arteries of the heart and is now administered selectively , because it uses .
D to diagnose coronary disease that involves the introduction of a dye into the arteries of the heart , is now administered selectively , because it uses .
E to diagnose coronary disease involving the introduction of a dye into the arteries of the heart , which is now administered selectively , uses
A 为何错?答案C |