They are ___________.[ ]
A. like
B. old
C. it
答案：B
His parents told him not ________. [ ]
A. be late
B. to late
C. to be late
D. be to late
钢筋混凝土预制桩用间隔重叠法制作时，其重叠层数一般不应超过（）层。
A．2
B．3
C．4
D．5
