题目内容
（请给出正确答案）
[主观题]
It is implied but not stated in the passage that __________. A. there was a shortage of
It is implied but not stated in the passage that __________.
A. there was a shortage of workers on American farms
B. the most important of the early invention was the iron plow
C. after 1869, many people devoted their attention to the plow
D. Charles Newbolt had made a fortune by his cast-iron plow
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