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

正确答案是：

同类题型

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