单选题 It ______ so cloudy and humid, you ought to carry an umbrella with you.
A. being B. to be
C. as being D. having been

【正确答案】 A

【答案解析】[解析] 逗号前面表明带伞的理由，是个句子，没有连词。it作为表示天气的非人称主语和主句的主语不同，天气的情况是主动意义，因此A项being是正确答案。