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题目内容
（阿坝师范学院大学英语）
It was essential that the application forms _______ back before the deadline. [
A、 ]. must be sent [
B、 ]. would be sent [
C、 ]. be sent [
D、 ]. were sent
A、 ]. must be sent [
B、 ]. would be sent [
C、 ]. be sent [
D、 ]. were sent
参考答案