题目内容：

one English grammer question
Within the last year,astronomers have come closer than ever___.
A.to deciding which of the questions is right
B.to decide which of the question is right
C.deciding whether the question is right or not
D.and decided which of the questions is right

优质解答

A
come close to是固定短语,所以是介词,不是不定式.
介词后用现在分词.