第1个回答 2020-01-23
翻译：
there
were
many
equipments
having
been
added
into
the
building
since
it's
built.
解析：1.there
be
句型，里面含有
since
引导的时间从句，故而是
“过去的现在”句式，本来该“
had
been
done
+since+过去式”
但句中含有there
be
doing
,因此，就有了had
直接
动名词
化！
2.
since
it
was
built
是
主谓结构，只是被动形态的！
3.这个句子不能没有表语，只是一个时间递进关系的句子：时间递进，
就是在某段时间发生了某件事、某个时间段存在有某种已经证实的存在！
希望可以帮到你！