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Mr. Black provides lonely people with telephone numbers to ring they are in trou

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Mr. Black provides lonely people with telephone numbers to ring they are in trou

Mr. Black provides lonely people with telephone numbers to ring ________ they are in trouble ________ he doesn't want them to be separated from others.

A.while, unless

B.if, though

C.since, but

D.when, because

试题答案

D

标签：theyringtoarehe

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