how long have you ___this book a.bought b.buy c had d buying为什么

How __(long /soon) have you had them How long have you been (since/ for)-- how long have you benn here?(since/ for)-- how long have you benn here? --__(since/ for) vhalf past three.选择哪个?为什么? How long __ you __(从事)the project?为什么答案是have,been working on现在完成时为have＋done，而这个是现在完成进行时 how long have you been learning english? How long have you been studying? How long have you been in China? how long have you been dancing today? how long have you studied in this How long have you been there? How long have you live in China How long have you ----(live)here? “How long have you been watching How long have you __?Since 1990.A.bought MP3 B.joined the Party C.lived in the town How long have you __ Shenzhen?Since 1996A.been in B.been to C.gone to could you tell me __?B.how often you go to the mall D how long you have been at this company理由是什么? could you tell me __?B.how often you go to the mall D how long you have bee at this company As a student,he is often told __ (study) hard.Tell me how long you __ (have) a cold ,Ever since last night.