![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
What did Henning study in his experiment?
A.
How students remember English vocabulary by short-term memory.
B.
How students learn second language by short-term memory.
C.
How to develop student’s ability in English.
D.
How long-term memory keeps information.