题目内容

I saw her in the office this morning. She ______ back to work without the doctor’s permission.

A. couldn’t come
B. couldn’t have come
C. should have come
D. should not have come

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Jane's pale face suggested that she ___ ill .

A. be
B. was
C. should be
D. is

If the United States had built more homes for poor people in 1955，the housing problems now in some parts of this country ________ so serious.

A. wouldn't be
B. will not have been
C. wouldn't have been
D. would have not been

后张预应力混凝土梁、板在孔道压浆后移运的，其压浆浆体强度应不低于设计强度的（）。

A. 60%
B. 70%
C. 75%
D. 80%

社会学家关于人类行为的基本假设，人类行为由（）所塑造。