20．It was four o'clock in the afternoonhe and his grandpa reached the museum in Guanghan,

20．It was four o'clock in the afternoon he and his grandpa reached the museum in Guanghan, an official warmly received them.
A. that; where
B. when; that
C. when; where
D. that; when

A. that; whereB. when; that(答案→)C. when; whereD. that; when解析：可联系答.案.网客服索取。

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