问题
问答题
It is essential__________(文件在这个周末前递交)．
答案
参考答案：that the document (should)be handed by this weekend
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It is essential__________(文件在这个周末前递交)．
参考答案：that the document (should)be handed by this weekend
压力大小将 _______。（选填“变大”、“变小”或“不变”）