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Once the pharmaceutical patents______, other companies can produce identical versions of the original drugs four times cheaper t
Once the pharmaceutical patents______, other companies can produce identical versions of the original drugs four times cheaper t
admin
2020-05-13
54
问题
Once the pharmaceutical patents______, other companies can produce identical versions of the original drugs four times cheaper than current rates.
选项
A、expire
B、expires
C、is expired
D、will be expired
答案
A
解析
空格处是条件状语从句连接词Once引导的从句的动词的位置。条件状语从句的主语是复数,因此要在(A)和(D)中选一个。在时间、条件状语从句中,一般用现在时态来代替将来时态,因此expire是正确答案。
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