问题
选择题
| The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again. |
A. after B. before C. since D. when |
答案
答案：B
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| The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again. |
A. after B. before C. since D. when |
答案：B