This case is too heavy. Could you _____ me a favor?


  1. A.
    to do
  2. B.
    doing
  3. C.
    do
C
試題分析：此題考查情態(tài)動詞could的基本用法，其后跟動詞原形。Do sb a favor表示給某人幫個忙。故選C。
考點：情態(tài)動詞的基本用法。
點評：情態(tài)動詞could是can的過去式，但在很多情況下它表達的是語氣而不是時態(tài)。這點需要給學(xué)生多多提示。此句表達的就是委婉的語氣。
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