Are the twins going to _____ at the party this evening?A.singB.singingC.sangD.have sung

问题描述:

Are the twins going to _____ at the party this evening?
A.sing
B.singing
C.sang
D.have sung

A

A, to 后面跟的是动词原形

选A sing
be going to do表示将要做什么.是固定搭配.