John______the office as he was passing, but Mary was out.

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问题 John______the office as he was passing, but Mary was out.

选项 A、called for
B、called up
C、called on
D、called at

答案D

解析 call for提倡、要求;call up召唤、使想起;call on号召、呼吁;call at访问、停靠。由句意可知,D项正确。
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