Exactly ____they did when at last they reached the sea remains a complete mystery.
A．thatB．howC．whichD．what
D
考查名詞性從句。句中what引導(dǎo)主語從句，在從句中作賓語。句意：當他們到達海邊最終確切做了什么仍然完全是個迷。
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