单选题 "Despite proving their grit in the two-month Ranger course, the two women are still unable to join infantry, armor and special forces units, but that could change after the Pentagon makes its recommendations." The modal auxiliary verb "could" in the sentence expresses ______.

A、 low possibility in the past
B、 high possibility in the past
C、 low possibility in the future
D、 high possibility in the future

【正确答案】 C

【答案解析】[解析] 情态动词。could在该句中表示推测性，而且是程度较低的可能性。虽然形式上是过去时，但是表示的时间概念是将来。在推测性用法中，情态助动词的现在时形式和过去时形式不是时间区分的主要标志，这两种形式所表示的时间往往与它们的“时”的形式不相一致。