在语法周练中，考研英语的答案如下：
1. 空格处应填入：A. because B. although C. unless D. although
答案：B. although
2. 空格处应填入：A. which B. who C. that D. what
答案：C. that
3. 空格处应填入：A. as soon as B. as long as C. in case D. once
答案：D. once
4. 空格处应填入：A. although B. because C. since D. unless
答案：A. although
5. 空格处应填入：A. what B. which C. that D. who
答案：B. which
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