Since computers were introduced, they____ to be useful tools for people weak in math.
A、had proved
B、have proved
C、 will prove
D、are proving
Directions:In each of the following groups of words, there are four underlined letters or ltter 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.
A、land
B、lamb
C、father
D、ladder
The organizers of the conference have arranged hotel rooms for those students_____from out of town.