The zoo will have to close ________ the local government agrees to give extra money.
A．untilB．whenC．unlessD．if
C
這里考查unless引導(dǎo)條件狀語從句，以為“如果…不…”。本句意為“如果當(dāng)?shù)卣煌忸~外撥款，動物園就得關(guān)閉。If的意思正好和unless相反。
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