问题
选择题
Exactly ____they did when at last they reached the sea remains a complete mystery.
A．that
B．how
C．which
D．what
答案
答案：D
考查名词性从句。句中what引导主语从句，在从句中作宾语。句意：当他们到达海边最终确切做了什么仍然完全是个迷。
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Exactly ____they did when at last they reached the sea remains a complete mystery.
A．that
B．how
C．which
D．what
答案：D
考查名词性从句。句中what引导主语从句，在从句中作宾语。句意：当他们到达海边最终确切做了什么仍然完全是个迷。