From industrial beginnings in the nineteenth century, plastics______through a hundred and
A. struggled
B. have struggled
C. are struggling
D. has struggled
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Each of the built-in costs of a product must bring in some profit at each stage: truckers
A. would not be
B. will not be
C. were not
D. can not be
Mary was quite considerate of her husband______ she used to make coffee for him when he wrote in the dead night.
A. in that
B. if
C. each time
D. once
儿童化脓性脑膜炎最常见的病原菌是
A. 大肠杆菌
B. 金黄色葡萄球菌
C. 脑膜炎双球菌
D. 肺炎链球菌
E. 流感嗜血杆菌
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