问题

__________ it’s very difficult, remember not to give up until the last minute.

A:Until
B:Unless
C:Although
D:Since;

正确答案是：

同类题型

Was it under the tree ____ you were away talking to a friend? — SureBut when I got back there, the bike was gone

_____ a pity that I forgot to bring yourdictionary.

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127. Young people usually have more energythan the old. The underlined word probably means _____.

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