单选题______Ahas to be Bmust be Cshould be Dought to be
单选题
______
A
has to be
B
must be
C
should be
D
ought to be
参考解析
解析：
汽油必须从原油中提炼.这是外在因素.因此用has to。
汽油必须从原油中提炼.这是外在因素.因此用has to。
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