In recent years，there have been over 30 foreign companies _____ business in ...

李老师

In recent years，there have been over 30 foreign companies _____ business in this city．
    A) doing      C) to do
B) do         D) done
5．It is easy to get the software we need __________the market is small．
    A) as if      C) although
B) so that    D) until
6．By the end of this year，they ______ a new program in Europe．
     A) had started     C) are starting
B) start          D) will have started
7．Language learning is a slow process，whic