It worried her a bit_____ her youngest son had caught a cold.
A. what
B.if
C.while
D.that
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______he said at the meeting surprised everyone present.
A.That
B. What
C. The fact
D.The matter
Musictherapyisusefulinrelievingstressandotherconditions.
Manypregnantwomencarryafetus(胎儿)withadifferentbloodtypefromtheirown.
斜齿轮尺寸计算时按照法面参数计算
A. 对
B. 错