问题

I’d like to invite you to a party tomorrow evening.– Thank you, but ______ I’ll be free I’m uncertain

A:while
B:if
C:when
D:whether

正确答案是：

同类题型

Once e-mail learners _______ with the basic knowledge of how to use the network, they ______ to a local network and a global network

下列词语书写完全正确的一项是( )

Excuse me. Could you please tell me ______ ‘-Sorry, I’m afraid I can’t. You can turn to our teacher for help.

依次填入下面一段文字横线处的语句，衔接最恰当的一组是天鹅悠闲自在、无拘无束，它时而在水上遨游， ——它似乎是很喜欢接近人的，只要它觉得我们不会伤害它。①时而沿着水边， ②回到有人的地方，③时而到岸旁嬉戏， ④享受着与人相处的乐趣，⑤时而离开它的幽居， ⑥藏到灯芯草丛中，

You’ve missed your ____， and you will have to wait forthe next round.