Question

In many people's opinion, that company, though relatively small, is pleasant ____.

A to deal with
B dealing with
C to be dealt with
D dealt with
答案是A，请问为什么不选C?

Answer 1

很好理解的，pleasant修饰that company,意思为：令人愉快的，是表明that company的品质。
不定式to deal with做状语。
整句意思：在许多人看来，尽管那家公司规模相对较小，但和它打交道却是件很惬意的事情。
这种说法很常见，比如:
The question is difficult to answer.这个问题很难回答

Answer 2

to deal with是用主动表达了被动的意义，更为简洁，已经为人们所接受。