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He sent the letter by air mail _____ it might reach them in

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He sent the letter by air mail _____ it might reach them in good time.A.because B.so as to
C.so that D.for
选C.整句话的意思是他用航空邮件发送这封信以便它能及时送到他们那里.because的意思是“因为”,for的意思之一也是“因为”,两者都可排除.so as to 和so that 的意思都是“以便、为了”,但前者后面跟动词,后者后面接从句,故而只有so that 符合,选C