电报句（双词句）
参考答案：
这种句子的表意功能虽较单词句明确，但其表现形式是断续的简略的结构不完整，好像成人的电报文件，故称为电报句或电报式语言。
在48的因数中，选4个不同的数组成比例是______．
The president, accompanied by his assistants, _____. [ ]
a. have arrived
b. are arriving
c. had arrived
d. has arrived
