为止
Students are expected to pay the loan back _____ they are earning enough.
Students are expected to pay the loan back \_\_\_\__ they are earning enough.
某人连续向一目标射击,每次命中目标的概率为,他连续射击直到命中为止,则射击次数为3的概率是()
某人连续向一目标射击,每次命中目标的概率为,他连续射击直到命中为止,则射击次数为3的概率是()C
—Is there anything wrong?—No, so far I _____ no trouble.
—Is there anything wrong?—No, so far I \_\_\_\__ no trouble.
一切物体总保持____或____直到有外力迫使它改变这种状态为止,这个定律叫____定律.
一切物体总保持\_\_\_\_或\_\_\_\_直到有外力迫使它改变这种状态为止,这个定律叫\_\_\_\_定律.