Surely nothing ____ going on there at 11 o’clock last night.
A. could be
B. must be
C. need be
D. shall be
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He said he ____ for 20 years by this summer.
A. will have been teaching
B. could have taught
C. would have been teaching
D. should have been teaching
It’s raining hard outside. You ____ stay here for the night.
A. might well
B. might as well
C. are justified
D. might just
混凝土搅拌机有（ ）。
A. 强制式搅拌机
B. 重力式搅拌机
C. 自落式搅拌机
D. 剪切式搅拌机
钢筋的连接有（ ）等方式。
A. 浆锚连接
B. 绑扎连接
C. 焊接连接
D. 机械连接
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