Join the following sentences to make one complete sentence without using and, but or so.
The school bus drove through the gate. The clock was striking eight at that moment.
Topic: Synthesis — clause of time
Answer
The school bus drove through the gate as the clock was striking eight. (Also acceptable: The clock was striking eight as the school bus drove through the gate.)
The phrase "at that moment" signals TIME, and the two events happened simultaneously — so AS or WHEN joins them.
AS is better than WHEN here because it carries the sense of two things happening together over a moment, which suits a clock in the act of striking. Note the tenses: the bus DROVE (simple past, a completed action) while the clock WAS STRIKING (past continuous, an action in progress). Keep both exactly as the original has them.
The phrase "at that moment" is absorbed into the conjunction and should not be repeated — writing "as the clock was striking eight at that moment" is redundant.