为什么独立结构里要用having done而不是用have/had done??
1.The sun _____,they continued their way.
A.has risen B.having risen C.has raised D.having raised
2.The country has sent up three unmanned spacecraft, the most recent ______at the end of last March.
A.has been launched B.having been launched
C.being launched D.to be launched
这两题都选having结构的吗??
那什么时候用did呢?