The above chemical fertilizer arrived safely at Shanghai______schedule but was found short delivered.
A、ahead
B、behind
C、on
D、at
【正确答案】：C
【题目解析】：ahead of schedule表示“提前”;behind schedule表示“迟于预定时间”；On schedule表示“按期，如期”。结合意，由but一词可选出C项。
The above chemical fertilizer arrived safely at Shanghai______sc
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