This case is too heavy. Could you _____ me a favor?
A．to do               B．doing           C．do

C

解析試題分析：此題考查情態(tài)動(dòng)詞could的基本用法，其后跟動(dòng)詞原形。Do sb a favor表示給某人幫個(gè)忙。故選C。
考點(diǎn)：情態(tài)動(dòng)詞的基本用法。
點(diǎn)評(píng)：情態(tài)動(dòng)詞could是can的過去式，但在很多情況下它表達(dá)的是語氣而不是時(shí)態(tài)。這點(diǎn)需要給學(xué)生多多提示。此句表達(dá)的就是委婉的語氣。

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