【C5】A．whyB．whichC．becauseD．what

The reason why Jack failed to attend the lecture is because he had a had cold.A．whyB．faile

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【C5】A．whenB．whichC．howD．it

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It is because English is very useful ________we study it hard.A: whyB: thatC: whatD: w

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I doubt_____he is the murderer because he is not on the scene at that moment.A．whyB．thatC．

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【C8】A．thatB．whichC．becauseD．as

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【C5】A．howB．whichC．thatD．what

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The reason______I came late for the meeting was because my car broke down.A．whyB．becauseC．

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