18. _____the result of the exam, she stood at the door of the classroom,disappointed.
A、Knowing
B、To be known
C、Known
D、To know
I . Phonetics( 5 points)Directions:In each of the following groups of words, there are four underlined letters or letter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation. Mark your answer by blackening the corresponding letter on the Answer Sheet.1.( )