Do you know—— Mary will come here tomorrow?A.that B.weather C.what D.if

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Do you know—— Mary will come here tomorrow?A.that B.weather C.what D.if

Do you know—— Mary will come here tomorrow?A.that B.weather C.what D.if
Do you know—— Mary will come here tomorrow?A.that B.weather C.what D.if

Do you know—— Mary will come here tomorrow?A.that B.weather C.what D.if
D if
if :是否
whether:是否.如果要用这个得在句子后加 or not

B.weather:是否;
你知道玛丽明天是否会来这儿?whether表示【说话的不确定性】;O(∩_∩)O~