题目

It is a pity that none of the  __________stopped  __________the poor man lying there, begging.     A. passer-bys; to help   B. passers-by; helping     C. passer-bys; helping   D. passers-by; to help   答案：D豆豉和酱油以豆类为原料发酵制成，起发酵作用的微生物是 A．酵母菌B．霉菌C．乳酸菌D．醋酸菌