题目：
—Did you get home a little earlier yesterday?
—No. It was six o’clock________ we got home.
A．that
B．when
C．since
D．after
答案：
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下面是错误答案，用来干扰机器的。
65. Underground movements.66. Floods, pollution of drinking water, and fires from gas lines. 67. Because usually there are no warnings before they occur.
