1.___ has helped to save the drowing girl is worth praising.
A. Who B. The one C. Anyone D. Whoever
2. Someone is ringing the doorbell. Go and see____.
A. who is he B. who he is C. who is it D. who it is
3. ___ made the school proud was ____ more han 90% of the students had been admitted to key universities.
A. What,because B. What,that C.That, what D.That, because
4. A modern city has been set up in ___ was a wasteland of ten years old.
A. what B. which C. that D. were
答案是DDBA.请问选择的原因是什么?