Parents advised me to communicate with my head teacher about the problem ________.
A:in public
B:in person
C:in half
There _____ many cars on the road.
It was only after he had read the papers ________ Mr. Gross realized the task before him was extremely difficult to complete.
血液从左心室射出后,经体循环回到右心房之前,不可能流经( )