us calmly together, our captain made an announcement we must save essential supplies before the day broke.
A. Calling; that
B. To call; that
C. Calling; which
D. To call; which
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(答案→)A. Calling; that
B. To call; that
C. Calling; which
D. To call; which
解析：本题考查非谓语动词及名词性从句。逻辑主语our captain与call之间的关系为主动关系，故用现在分词；that引导的为同位语从句，从句不缺少成分。选A。