20.It takes about 12 seconds to reverse ______ full speed ahead ______ full speed astern.
A.at, to
B.to, from
C.from, to
D.at, from
正确答案是C
20.It takes about 12 seconds to reverse ______ full speed ahead ______ full speed astern.
A.at, to
B.to, from
C.from, to
D.at, from
正确答案是C