当你询问“他们正在干什么”时，说：
A. What are they doing ?
B. When do they go home ?
C. Where are they going ?
相关试题
选择合适的词或短语把句子补充完整，把单词填在括号内。
（1）He is my friend. He is.__________.
（2）We have a new________. It’s very big.
（3）This is my grandfather. He has______.
（4）I have a______ in my schoolbag.
（5）Hui Tailang is not_______.
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