______he wants to write back,we have sent a stamped addressed envelope.A．Unless_刷题宝

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______he wants to write back,we have sent a stamped addressed envelope.

A．Unless	B．Even if
C．In case	D．As long as

上一题下一题 0.64难度单项选择更新时间:2016-09-13 05:07:39

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