Jake didn't come to school,I don't know ___.A.for B.that C.because D.why选什么?为什么?

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• I'm very glad to see you.I ( ) you had come already.A.don't know B.haven't know C.didn't know D.hadn't know选什么?为什么?
• Jake didn't come to school,I don't know ___.A.for B.that C.because D.why选什么?为什么?
• I'm glad to meet you,Lucy.I ____ you____.A.don't know,have comeA.don't know,have come B.don't know,will come C.didn't know,would come选什么?为什么?
• Jake didn't come to school,I don't know ___.A.for B.that C.because D.why
• he didn't come yesterday because he was ill.he didn't come yesterday【】【】his【】
• It is because that he didn't know her.that放在句中有没有错