It’s hard to imagineit would be like living on Mars.A. thatB. howC. whereD. what

问题补充：

It’s hard to imagineit would be like living on Mars.

A. that

B. how

C. where

D. what

答案：

A. that

B. how

C. where

(答案→)D. what

解析：D【命题立意】考查宾语从句。

【解题思路】分析句子成分可知，此句为宾语从句，且从句中缺少宾语，所以用关系代词what引导。故答案选D。句意为：很难想象，生活在火星上会是什么样子。