— Come and join us, Ben!— I'm afraid I can't. I'm too busy now. If I ________ time, I would certainly go.
A:had
B:will have
C:have had
D:have
jùn
dàn
诸____县苦秦吏者
一食或尽粟一____
舌表面密布许多小凸点,内藏____,其内有许多____细胞。
第一个发现电流磁效应的科学家是( )