①Don't try to get off the bus ____it has stopped
问题描述:
①Don't try to get off the bus ____it has stopped
A,while B,as C,since D,before
②We'll go and see the patient ___we are busy
A,even if B.for C.if D.while
③---you understang this rule,you will have no further difficulty
A,once B,at once C,Only D,only then
答
1. D
2. A
3. A