Hi, Much of the immune system's machinery is geared towards killing or eliminating invading microbes -- they have been recognized. A) once B) in case KPDS, a nationwide exam in Turkey, was delivered on 5 December, 2010. One of the 'controversial' questions of the exam is above.
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Linguaphile One of the 'controversial' questions of the exam is above. The official correct answer is A) once, but some people think B is as correct, especially in American English.I don't know why it's controversial. A is the correct answer, and I can tell you, as an American, that B is not correct! Sorry!