祈使句只能用and不能用then吗?为什么?

祈使句只能用and不能用then吗?为什么?

题目
祈使句只能用and不能用then吗?为什么?
答案
如果选项前边有个逗号,就用and;否则用then.
例如:Look around you at the wen and women whom you can call as happy as a king,______ you will see that they all have certain things in common.
A.but B.then C.and D.which
答案:C
Look around you at the wen and women whom you can call as happy as a king______ you will see that they all have certain things in common.
A.but B.then C.and D.which
答案:B
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