Range of Opponent to River Bet?

[TPTK77]

In this hand, I would like to know what range do u think villain is betting here on the river with. It is suspicious that he check calls the flop, and then checks when the 7c comes and all the draws get there. Even though I hit my straight, can I call a bet on the river enough of the time even though there are 3 clubs on the board. I think he checks all pairs with Ax, and 2-pairs except AQ. The board is very drawy, so I'd be interested to see what he could make this play with.

FullTiltPoker Game #4072883755: Table Esmont (6 max) - $0.50/$1 - No Limit Hold'em - 23:28:47 ET - 2007/11/04
Seat 1: TPTK77 ($98.50)
Seat 2: binxer123 ($132.75)
Seat 3: Str8_Pride ($44.80)
Seat 4: howie19692007 ($86.40)
Seat 5: justakeit ($116.10)
Seat 6: yucimus ($114.15)
binxer123 posts the small blind of $0.50
Str8_Pride posts the big blind of $1
The button is in seat #1
*** HOLE CARDS ***
Dealt to TPTK77 [9h Th]
howie19692007 calls $1
justakeit folds
yucimus calls $1
TPTK77 raises to $5.50
binxer123 folds
Str8_Pride folds
howie19692007 has 15 seconds left to act
howie19692007 calls $4.50
yucimus folds
*** FLOP *** [Ac 8s Jc]
howie19692007 has 15 seconds left to act
howie19692007 checks
TPTK77 bets $7
howie19692007 calls $7
*** TURN *** [Ac 8s Jc] [7c]
howie19692007 checks
TPTK77 checks
*** RIVER *** [Ac 8s Jc 7c] [Qd]
howie19692007 has 15 seconds left to act
howie19692007 bets $27.50
TPTK77 ????????

[early325]

yes you win enough to call here, but cbet more than 1/2 of the pot, and bet the turn.

[cbboy]

Bet a lot more on the flop. Bet the turn. I think its more of a decision whether to raise the river or not instead of whether to fold...

[ikestoys]

b/f turn...
100% of the time.