Question

These machines can help recycle the waste which would ______be thrown away.

A．otherwise

B．therefore

C．however

D．though

Answer 1

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。