—I don't know ____ my friends will come here or not. —It's raining outside. But I think they will come.

1.—I don't know ____ my friends will come here or not.

—It's raining outside. But I think they will come.

A. why B. that C. what D. whether

【考点】

if或whether引导的宾语从句;

【答案】

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