问题
选择题
68 It was at four o'clock in the afternoon ____ he and his grandpa reached the museum in Guanghan.
A．while
B．that
C．when
D．As
答案
答案：B
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68 It was at four o'clock in the afternoon ____ he and his grandpa reached the museum in Guanghan.
A．while
B．that
C．when
D．As
答案：B