I helped my mother buy two ________________ eggs in the supermarket.
A. dozens
B. dozen
C. dozens of
D. dozen of
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It's noisy outside. Please speak loudly to make yourself ___________________.
A. understand
B. be understood
C. understood
D. understanding
He did not know ____________________.
A. how could he get there
B. how he can get there
C. how to get there
D. how could get there
T细胞参与的免疫是
A. 细胞免疫
B. 体液免疫
C. 先天性免疫
D. 获得性免疫
E. 以上均正确
B细胞参与的免疫是
A. 细胞免疫
B. 体液免疫
C. 先天性免疫
D. 获得性免疫
E. 以上均正确
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