_____all the representatives still not there ，the meeting was postponed for several hours.
A、BecauseB
with加名詞短語，表示原因，本句意思為：“因為所有的代表還沒有到場，會議被推遲了好幾個小時”。而because(因為)引導的是原因狀語從句，其后必須是個從句。by為“到??為止”。
Mywalletisnowheretobefound.I_____itwhenIwasonthebus.
It ‘s_____my power to make final decision on the matter.
Bothofmybrothersarenowmarried，soIhavetwo_____.
_____alltherepresentativesstillnotthere，themeetingwaspostponedforseveralhours.
I can speak_____German.
