问题
The letters for the boss________on his desk but he didn’t read them until three days later (2012·天津，2)
A:were put
B:was put
C:put
D:has put
B:was put
C:put
D:has put
正确答案是：
同类题型
achieve a lot when we learn to let our differences unite, rather than _________us.
___ nearly all behavior is learned behavior is a basic assumption of social scientists.
st have read about Mark Twain long ago, ____
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