【題目】If your best friend tells you his secrets, it's _______ for you to keep them for him. By doing this, you can win others' trust.
A.special
B.necessary
C.possible

【答案】B
【解析】如果你最好的朋友告訴你他的秘密，對于你來說為他保持這個(gè)秘密是很必要的。通過這樣做，你可以贏得別人的信任。It's + 形容詞+for sb.+ to do sth.意指“對于某人來說做某事很adj.”。 A. special特殊的；B. necessary必要的；必需的；C. possible可能的；根據(jù)語境，故選B。

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