Question

Mary is always pleased _______  _______ at the party

1. A.
   to invite; to sing
2. B.
   to invite; singing
3. C.
   to be invited: to sing
4. D.
   to be invited; singing

Answer 1

C
考查非谓语动词。句意：玛丽总是很高兴被邀请在聚会上唱歌。不定式表示具体的将要进行的动作，结合语境可知玛丽是被要邀请的对象，故用被动语态。下文为玛丽的逻辑动作，故用主动语态，选C。