______1987, membership in the World Agricultural Foundation has fallen by 20 percent.

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问题 ______1987, membership in the World Agricultural Foundation has fallen by 20 percent.

选项 A、Into
B、For
C、Since
D、During

答案C

解析 解决问题的线索是句子的时态。空格后面出现了1987年,所以其后可以接时间的(B)、(C)、(D)都有可能是正确答案,而表示“自……以来”的介词却只有(C)since一个。since后面不接时间点而接句子时,句子要用过去时态,如I have knownher since she was a child。
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