With the effects of global warming, trees          their leaves much later in the year.

A. are losing      B. have lost            C. lost             D. were losing 

With the effects of global warming, trees          their leaves much later in the year.

1. A.
   are losing
2. B.
   have lost
3. C.
   lost
4. D.
   were losing

With the effects of global warming, trees          their leaves much later in the year.

A．are losing               B．have lost            C．lost                D．were losing

With the effects of global warming, trees         their leaves much later in the year.

A．are losing           B．have lost             C．lost            D．were losing

With the effects of global warming, trees          their leaves much later in the year.

A．are losing         B．have lost             C．lost           D．were losing