题目内容
（请给出正确答案）
[主观题]
Why did Tommy Carter go to China for his soybean research？A．China is the only country to g
Why did Tommy Carter go to China for his soybean research？
A．China is the only country to grow soybeans.
B．China is the ancestral home of soybeans.
C．China has a long history of growing soybeans.
D．China has different kinds of soybeans.
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