Selecting Rows From Two Tables With JOIN And Ordering Problem

Hi,

First the environment: two tables A and B.

Table A: ID (unique-identifier)
Table B: ID_A (unique-identifier to A.ID, relation)

DTime (datetime)

Rows (id1 and id2 are Id examples):
A: id1
id2
B: id1 and 12:00:00 (date not important)
id1 and 13:00:00
id2 and 12:00:00

Example:
SELECT A.ID, B.DTIME
FROM A
LEFT JOIN B ON B.ID_A = A.ID
WHERE B.DTime < '14:00:00'
ORDER BY NEWID()

When I run this, I get the three rows of table B. But what I want is to get each table A row once, and get the nearest datetime of WHERE expression from the relation of table B.
So, the result must been two rows, id1 and id2, and id1 with '13:00:00' row because this is the nearest value of '14:00:00'.

How can I do this? DISTINCT trying by A.ID of SELECT, but doesn't work. Also ORDER BY B.DTime will work, but not random by NEWID() anymore.

Thank you.