Only when our country has aircraft carriers _______ our distant islands more effectively.
A．we can guardB．can we guardC．we guardD．do we guard
考查倒裝句。only +狀語(yǔ)提前主謂用部分倒裝。故排除A、C,根據(jù)意思，只有當(dāng)我們國(guó)家有航空母艦時(shí)，我們才能夠更有效地保護(hù)我們遠(yuǎn)方的島嶼。
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