为什么Please call John at 495--3539 不能去掉call

为什么Please call John at 495--3539 不能去掉call 为什么Please call John at 495--3539不能去掉at 快 call john please 5430-8902 at(.)连词成句 FoundIs this your book?Please call John at 4958456. FoundIs kate,please call john back now.call又没有错 Please call John ( )578-6948.A.at B.on C.in D.o call me at中的me能不能去掉 Please call Bill at 790-4230 (call) 用同义词替换 Call Alan at 495-3539 翻译 at,Alan ,485-3538,please,call联句 Please call at 451310 for more i______ Please call Mary at 555-8502是什么意思