:We shall send you four samples ________ receipt of your inquiries.A:forB:inC:atD:upon答案: upon4、
:We shall send you four samples ________ receipt of your inquiries.A:forB:inC:atD:upon答案: upon4、
:We shall send you four samples ________ receipt of your inquiries.A:forB:inC:atD:upon答案: upon4、