Why not an order a TV set of this new type?A. placing; onB. place; onC. place; forD. pla

问题补充：

Why not an order a TV set of this new type?

A. placing; on

B. place; on

C. place; for

D. placing; for

答案：

A. placing; on

B. place; on

(答案→)C. place; for

D. placing; for

解析：place an order for sth. 意为“订购某物”；why not 后面应跟动词原形。