We must not get discouraged such a minor setback (挫折).A. becauseB. because ofC. sinceD. as

问题补充：

We must not get discouraged such a minor setback (挫折).

A. because

B. because of

C. since

D. as

答案：

A. because

(答案→)B. because of

C. since

D. as

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