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All the must be cautious of the dangerous wall. [ ]A. passer-by B. passer-bys C.

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All the must be cautious of the dangerous wall. [ ]A. passer-by B. passer-bys C.

All the ______ must be cautious of the dangerous wall.

[     ]

A. passer-by
B. passer-bys
C. passers-by
D. passers-bys

试题答案

C