Though iPhone 4 is such a hit product, I won’t buy one unless its after service ______.
A．was improved B．gets improvedC．is improving D．had got improved
B
主句I won’t buy one用的是一般將來時態(tài)，所以unless引導(dǎo)的條件狀從要用一般現(xiàn)在時表將來；且its after service和improve的動賓關(guān)系，所以用一般現(xiàn)在時態(tài)的被動語態(tài)。選B。
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