初中英语连词成句单选题

— I hear the famous singer Xu Song may come to Ningbo next month.
— Really? _______ he comes, my younger sister will be very excited.

A．If

B．Until

C．Unless

D．Before

The weather is hot, ____ the man is still wearing his coat.

A．and

B．but

C．so

D．in

Mary did’ t go to bed       everything was ready for the party.

A．when

B．if

C．because

D．until

Hurry up, _______ you can’t catch the first train.

A．and

B．but

C．or

D．so

Several days has passed_______the air crash（空难） happened.
A.since                  B.after                C.as