单选题 Having a trip abroad is certainly good for the old couple, but it remains ______ whether they will enjoy it.
  • [A] to see
  • [B] to be seen
  • [C] seeing
  • [D] seen


【正确答案】 B
【答案解析】[精解] 这是一个主语从句。it作形式主语，whether they will enjoy“作真正的主语。remain后接to do sth. 作表语。see与主语从句是动宾关系，所以此处要用to be seen，表将来。