Only when our country has aircraft carriers (航空母艦), _____________ our distant islands more effectively.
A．we can guardB．can we guardC．we guardD．do we guard
B
考查only引導(dǎo)的的部分倒裝句。Only引導(dǎo)的倒裝句必須滿足兩個條件，only必須放在句首，必須強(qiáng)調(diào)狀語。本題滿足這兩個條件，所以選擇B。
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