问题
单项选择题
An LWT anchor often has difficulty tripping in（）.
A.sand
B.soft soil
C.stiff clay
D.heterogeneous soil
答案
参考答案：B
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An LWT anchor often has difficulty tripping in（）.
A.sand
B.soft soil
C.stiff clay
D.heterogeneous soil
参考答案：B
