—It’sverykind          Bettytogiveusahand.—That’strue.W...

問題詳情：

— It’s very kind           Betty to give us a hand.

— That’s true. We should thank her           helping us out.

A. for; for         B. of; for         C. for; of        D. of; of

【回答】

B

知識點：介詞和介詞短語

題型：選擇題