后张法预应力混凝土构件施工时，预应力钢筋张拉需等到混凝土强度达到设计强度的()以上时方可进行。
A. 0.7
B. 0.75
C. 0.8
D. 0.9
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It was almost dark in the street______ a few spotlights.
A. excluding
B. except for
C. except
D. but for
Henry's remarks left me______ about his real purpose.
A. wonder
B. wondered
C. to wonder
D. wondering
A．showB．trickC．tryD．program
A. show
B. trick
C. try
D. program
How does the author look at procrastination？
A. It is something like running.
B. It is a disease of mind.
C. It is not a permitted act.
D. It is not full of stress.
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