Ma Ke is giving a speech to raise funds for cancer research. He has brought a donation signup form for his listeners to sign. When should he circulate the signup sheet? ( )
A、beforebeginninghisspeech
B、afterrevealinghisspeechtopic
C、whileexplainingtheneedforcancerresearch
D、afterhehasfinishedspeaking
发布时间：2024-09-10 10:57:30
