关于油基钻井液的优点下列叙述正确的是（）。
A、抑制性强
B、润滑性好
C、对油气层损害小
D、以上都是
参考答案：D
.
--- Shall we go shopping together this afternoon?
--- _______. I will be very busy then.
A．Out of question
B．Out of the question
C．No problem
D．Good idea
I can never forget the day ____we worked together and the day _____we spent together.
A．when; which
B．which; when
C．what; that
D．on which; when
