【单选题】Which of the following sentences is INCORRECT? A . Poultry are very expensive in the city . B . New machinery were introduced in the factory . C . The police are investigating the murder case D . The...
A.
Poultry are very expensive in the city .
B.
New machinery were introduced in the factory .
C.
The police are investigating the murder case
D.
The militia were called out to rescue flood victims .