—Oh! I failed again.—Don’t lose heart. One more effort (努力) you will succeed.A. so thatB

问题补充：

—Oh! I failed again.

—Don’t lose heart. One more effort (努力), you will succeed.

A. so that

B. since

C. however

D. and

答案：

A. so that

B. since

C. however

(答案→)D. and

解析：句意：--哦，我又失败了。--不要失去信心。你多一份努力，你就会成功。两个句子之间的关系是递进，因此用and连接， 故选D