By the time you arrive, I ________ working for two hours．
(1)【◆题库问题◆】：[单选] By the time you arrive, I ________ working for two hours．A．will beB．canC．will have beenD．have been
Dhave(1)【◆题库问题◆】：[单选] By the time you arrive, I ________ working for two hours．A．will beB．canC．will have beenD．have been