If the American government      the expert’s suggestion, the world economy would not be in such a mess now.

If the American government      the expert’s suggestion, the world economy would not be in such a mess now.

A．followed                              B．follows

C．should follow                          D．had followed

If the American government      the expert’s suggestion, the world economy would not be in such a mess now.

1. A.
   followed
2. B.
   follows
3. C.
   should follow
4. D.
   had followed