第一部分:单项选择(共20小题,每题1分,满分20分)
1. several days later, most of the buildings ________ were repaired.
a. been damaged b. had been damaged c. which had been damaged d. which been damaged
2. we must not get discouraged ________such a minor setback (挫折) we have made.
a. because of b. because c. since d. as
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