问题
选择题
These machines can help recycle the waste which would ______be thrown away.
A．otherwise
B．therefore
C．however
D．though
答案
答案：A
考查词义辨析。otherwise 否则，要不然，therefore 因此，however 然而，though 然而，这些机器能帮助回收要不然会扔掉的废物。所以选A。