1. All of the flowers now raised here have developed from those _______ in the forest.

¡¡¡¡A. once they grew                        B. they grew once

¡¡¡¡C. they once grew                        D. once grew

¡¡¡¡2. In the office I never seem to have time until after 5:30 pm, _____ many people have gone home.

¡¡¡¡A. that                                         B. which

¡¡¡¡C. whose time                              D. by which time

¡¡¡¡3. Is this the reason _______ at the meeting for his carelessness in his work?

¡¡¡¡A. he explained                             B. what he explained

¡¡¡¡C. how he explained                      D. why he explained