问题

We were having a meeting ______ suddenly someone knocked at the door[ ]
A: because
B: when
C: as
D: while
B: when
C: as
D: while
正确答案是:
同类题型
A:Mum, how can I make the cake more deliciousB:Add some eggs and mix them_______milk.
What is the price of gas these days? —Oh, it ____________ sharply since last month
What’s the chance of ________ a general election thisyear
Does your wife like tea?— Well, she doesn’t really____ tea; she likes coffeebetter.[ ]
I doubt ____________all the people invited will come to attend the ceremony in such bad weather