-can you____chinese?-no,but I first__it to my chinese student.

问题描述:

-can you____chinese?-no,but I first__it to my chinese student.
a.speak,say
b.speak,tell
c.speak,told
请说明原因,thanks
but参考答案上 说是第二空接的是双宾语用tell,请问一下什么是双宾语?

speak say