I must be off now. My friends outside.A. waitB. have waitedC. were waiting D. are waiting

问题补充：

I must be off now. My friends outside.

A. wait

B. have waited

C. were waiting

D. are waiting

答案：

A. wait

B. have waited

C. were waiting

(答案→)D. are waiting

解析：考查时态。句意：我现在必须得走了，我的朋友正在外面等我。根据句意说明说话的时候我的朋友正在外面等着我，所以使用现在进行时的时态。现在进行时表示正在进行，正在发生的事情。故D正确。