问题
They often change the kind of crop ineach field ____ few years, for example, growing corn or wheat and then the nextyear peas or soybeans. A. every B.a C.each D.some
A:absolutely
B:It’s dangerous for rocket scientists to build rockets
C:Maybe it has something to do with the mystery of space travel
D:some
B:It’s dangerous for rocket scientists to build rockets
C:Maybe it has something to do with the mystery of space travel
D:some
正确答案是：
同类题型
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How are you getting on with your work—I can’t do it anylonger. I’ll have to get help.
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