Linda can't attend the party( )at Tom's house at present bacause she is preparing a speech for the party( )at Marie's ho

问题描述:

Linda can't attend the party( )at Tom's house at present bacause she is preparing a speech for the party( )at Marie's house tomorrow.
A.being held;to be held
B.to be held;held
C.held;being held
D.to be held;to be held
请给出相应的语法解析,拒绝菜鸟

A 前面是指正在进行 所以用进行时
后面那个party 是将要被举办的 所以用不定式