Busy _____ he was, he tried his best to help you.A．asB．whenC．sinceD．for_刷题宝

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Busy _____ he was, he tried his best to help you.

A．as	B．when
C．since	D．for

上一题下一题 0.4难度单项选择更新时间:2019-02-01 06:46:33

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