从一个装有20个红球和黄球的袋中，每次摸出一个球，记下颜色后再放入袋中，摇匀再摸，这样共摸10次，其中共摸到黄球4次，请根据这一情况，计算袋中红球可能有______个．

He did not write _________,though(尽管)he had______ ­­­­­­­­­­­。

A．careful enough; enough time

B．carefully enough;enough time

C．enough careful;enough time

D．enough carefully; time enough