单项选择题
In order to continue to learn by ourselves when we have left school, we must () learn how to study in the school now.
A．in all B．after all C．above all D．at all
单项选择题 Their cheerful voices showed that they were having a () discussion.
单项选择题 —How can I use this washing machine —Well, just refer to the().
单项选择题 Historically, () main material for making tables has been wood, but ()metal and stone have also been used.
