He__(write)a novel since last month and will finish it soon
问题描述：
He__(write)a novel since last month and will finish it soon
填什么?
答
has been writing 一直在写
“since+过去时间”用于“现在完成时（have/has done sth.）表示已完成的动作”或“现在完成进行时(have/has been doing sth.)表示一直在持续的动作”,根据后半句“will finish it soon（不久将完成）”,表明还没写完,所以用现在完成进行时.
整句意思：自从上个月以来他就一直在写小说,不久就将写完.