未知题型 The ancient Egyptians are supposed _________ rockets to the moon.A) to send B) to be sending C) to have sent D) to have been sending

未知题型 Features such as height, weight, and skin color _______ from individual to individual and from face to face.A) change B) vary C) alter D) convert

未知题型 Although he had looked through all the reference material on the subject, he still found it hard to understand this point and her explanation only _____ to his confusion.(A) extended (C) added(B) amounted (D) turned