许多食品制作都要利用细菌和真菌．下列可用于制造“银麦啤酒”的是（ ）
A．酵母菌
B．青霉
C．醋酸菌
D．乳酸菌
答案：A
When he ______ the door, he found his keys were nowhere. [ ]
A. would open
B. opened
C. had opened
D. was to open
简述社会主义发展道路的多样性？
