-Tom has a lot of parties recently.
- Yes, that may ________ why he didn’t do well in the test.

-Tom has a lot of parties recently.

- Yes, that may ________ why he didn’t do well in the test.

A．sum up                               B．add up to

C．account for                            D．make sense of

18．--- Tom has a lot of parties recently.

---Yes, that may ____ why he didn’t do well in the test.

A, sum up           B. add up to               C. account for     D. make sense of

---Tom has a lot of parties recently.
--- Yes, that may ________ why he didn’t do well in the test.

1. A.
   sum up
2. B.
   add up to
3. C.
   account for
4. D.
   make sense of

18．--- Tom has a lot of parties recently.

---Yes, that may ____ why he didn’t do well in the test.

A, sum up            B. add up to                C. account for      D. make sense of