重症肌无力患者，治疗过程中出现发热39℃，呼吸急促，体检：右下肺少量细湿啰音。下列哪

若a=1，|b|=4，则ab的值为______．

—How much farther shall we have to go?

—Another five miles until we reach the mountain_________.

.

A．at a distance

B．in a distance

C．at distance

D．in the distance

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