When you go outing with your sisters, you must see to ________ that they are safe.
A．everythingB．itC．themD．yourself
B

試題分析：固定詞組。固定詞組see to it that…務(wù)必…；句意：當(dāng)你和你妹妹們外出的時候，你務(wù)必要確定她們的安全。故B正確。
點評：固定詞組see to it that…務(wù)必…；
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