—What about your TEFL test?

—I have answered all the questions, but I’m not sure _____ I could get a high enough score. 

A．what

B．if

C．when

D．why

孕妇，32岁，孕1产0。现妊娠33周，近10d自觉头晕、乏力、心悸及食欲减退。查体：面色苍白，HR100次/分，胎位、胎心及骨盆测量均正常，血红蛋白80g/L，血细胞比容0.25

首选的药物为（）。

A.口服叶酸

B.少量多次输血

C.肌内注射右旋糖苷铁

D.口服硫酸亚铁

E.肌内注射维生素B₁₂