A、  B、  C、  A本句是询问需要多少工人的How疑问句。需要理解How many…常用来询问数量。

Where will you be going on vacation?
(A)No, I won’t.
(B)I’m leaving Thursday.
(C)Skiing in the mountains.

How many workers did you request?
(A)I asked for 20.
(B)For a construction project.
(C)That may cost too much.